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Молярная масса ортофосфорной кислоты 98 г. 41,16 г ортофосфорной кислоты составляют 41,16/98=0,42 моля, а количество молекул равно 0,42*6,02*10^23 штук.
Медным купоросом называется кристаллогидрат сульфата меди(II) — CuSO4·5H2O. В «молекуле» медного купороса содержится 1+1+4+5*(2+1)=21 атом. Слово молекула взял в кавычки. Потому что не существует молекул медного купороса (как и большинства неорганических веществ, а есть лишь условная счётная единица, которую и пишем при описании вещества или в уравнениях реакций). Итак в 1 моле медного купороса содержится 21*6,02*10^23 атомов, Значит 0,42*6,02*10^23 атомов содержится в 0,42*6,02*10^23/(21*6,02*10^23)=0,02 моля медного купороса.
Молярная масса медного купороса 64+32+4*16+5*18=250 г, а масса 0,02 моль равна 250*0,02=5 г.
Заодно отвечу и на другой Ваш вопрос о массе медного купороса (Определите массу (г) медного купороса, содержащего 1,204•10^23 атомов водорода.).
Как видно из вышеизложенного, в 1 моле медного купороса содержится 10*6,02*10^23=60,2*10^23 атомов водорода. Значит 1,204•10^23 атомов водорода содержатся в 1,204•10^23/(60,2*10^23 )=0,02 молях (5 г) медного купороса.
- Формула: CuO4S или CuSO4
- Относительная молекулярная масса CuO4S: 159.6086
- Молярная масса CuO4S: 159.6086 г/моль (0.15961 кг/моль)
| Элемент | Всего атомов | Атомная масса, а.е.м. | Общая масса атомов, а.е.м. |
|---|---|---|---|
| Cu (медь) | 1 | 63.546 | 63.546 |
| O (кислород) | 4 | 15.9994 | 63.9976 |
| S (сера) | 1 | 32.065 | 32.065 |
| 159.6086 |
Расчёт молярной и относительной молекулярной массы CuO4S
- Mr[CuO4S] = Ar[Cu] + Ar[O] * 4 + Ar[S] = 63.546 + 15.9994 * 4 + 32.065 = 159.6086
- Молярная масса (в кг/моль) = Mr[CuO4S] : 1000 = 159.6086 : 1000 = 0.15961 кг/моль
Расчёт массовых долей элементов в CuO4S
- Массовая доля меди (Cu) = 63.546 : 159.6086 * 100 = 39.814 %
- Массовая доля кислорода (O) = 63.9976 : 159.6086 * 100 = 40.097 %
- Массовая доля серы (S) = 32.065 : 159.6086 * 100 = 20.09 %
Калькулятор массы
Вычисление молярной массы
To calculate molar mass of a chemical compound enter its formula and click ‘Compute’. В химической формуле, вы можете использовать:
- Любой химический элемент. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
- Функциональные группы:D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
- круглые () и квадратные [] скобки.
- Общие составные имена.
Примеры расчета молярной массы:
NaCl,
Ca(OH)2,
K4[Fe(CN)6],
CuSO4*5H2O,
water,
nitric acid,
potassium permanganate,
ethanol,
fructose.
Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.
Вычисление молекулярной массы (молекулярная масса)
Для того, чтобы рассчитать молекулярную массу химического соединения, введите её формулу, указав его количество массы изотопа после каждого элемента в квадратных скобках.
Примеры молекулярные вычисления веса:
C[14]O[16]2,
S[34]O[16]2.
Определение молекулярной массы, молекулярный вес, молекулярная масса и молярная масса
- Молекулярная масса ( молекулярной массой ) это масса одной молекулы вещества, выражающаяся в атомных единицах массы (и). (1 и равна 1/12 массы одного атома углерода-12)
- Молярная масса ( молекулярной массой ) является масса одного моля вещества и выражается в г / моль.
Массы атомов и изотопов с NIST статью .
См. также: молекулярные массы аминокислот
From Wikipedia, the free encyclopedia
Crystals of CuSO4·5H2O |
|
Portion of the structure of the pentahydrate Cu(H2O)2+4 centers) |
|
Unit cell of the crystal structure of CuSO4·5H2O |
|
| Names | |
|---|---|
| IUPAC name
Copper(II) sulfate |
|
Other names
Copper Sulphate pentahydrate |
|
| Identifiers | |
|
CAS Number |
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|
3D model (JSmol) |
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| ChEBI |
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| ChEMBL |
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| ChemSpider |
|
| ECHA InfoCard | 100.028.952 
|
| EC Number |
|
|
Gmelin Reference |
8294 |
| KEGG |
|
|
PubChem CID |
|
| RTECS number |
|
| UNII |
|
|
CompTox Dashboard (EPA) |
|
|
InChI
|
|
|
SMILES
|
|
| Properties | |
|
Chemical formula |
CuSO4 (anhydrous) CuSO4·5H2O (pentahydrate) |
| Molar mass | 159.60 g/mol (anhydrous)[2] 249.685 g/mol (pentahydrate)[2] |
| Appearance | gray-white (anhydrous) blue (pentahydrate) |
| Density | 3.60 g/cm3 (anhydrous)[2] 2.286 g/cm3 (pentahydrate)[2] |
| Melting point | 110 °C (230 °F; 383 K) decomposes
560 °C decomposes[2](pentahydrate) Fully decomposes at 590 °C (anhydrous) |
| Boiling point | decomposes to cupric oxide at 650 °C |
|
Solubility in water |
1.055 molal (10 °C) 1.26 molal (20 °C) 1.502 molal (30 °C)[3] |
| Solubility | anhydrous insoluble in ethanol[2] pentahydrate |
|
Magnetic susceptibility (χ) |
1330·10−6 cm3/mol |
|
Refractive index (nD) |
1.724–1.739 (anhydrous)[4] 1.514–1.544 (pentahydrate)[5] |
| Structure | |
|
Crystal structure |
Orthorhombic (anhydrous, chalcocyanite), space group Pnma, oP24, a = 0.839 nm, b = 0.669 nm, c = 0.483 nm.[6] Triclinic (pentahydrate), space group P1, aP22, a = 0.5986 nm, b = 0.6141 nm, c = 1.0736 nm, α = 77.333°, β = 82.267°, γ = 72.567°[7] |
| Thermochemistry | |
|
Std molar |
5 J/(K·mol) |
|
Std enthalpy of |
−769.98 kJ/mol |
| Pharmacology | |
|
ATC code |
V03AB20 (WHO) |
| Hazards | |
| GHS labelling: | |
|
Pictograms |
 
|
| NFPA 704 (fire diamond) |
2 0 1 |
| Flash point | Non-flammable |
| Lethal dose or concentration (LD, LC): | |
|
LD50 (median dose) |
300 mg/kg (oral, rat)[9]
87 mg/kg (oral, mouse) |
| NIOSH (US health exposure limits): | |
|
PEL (Permissible) |
TWA 1 mg/m3 (as Cu)[8] |
|
REL (Recommended) |
TWA 1 mg/m3 (as Cu)[8] |
|
IDLH (Immediate danger) |
TWA 100 mg/m3 (as Cu)[8] |
| Safety data sheet (SDS) | anhydrous pentahydrate |
| Related compounds | |
|
Other cations |
|
|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references |
Copper(II) sulfate, also known as copper sulphate, is an inorganic compound with the chemical formula CuSO4. It forms hydrates CuSO4·nH2O, where n can range from 1 to 7. The pentahydrate (n = 5), a bright blue crystal, is the most commonly encountered hydrate of copper(II) sulfate. Older names for the pentahydrate include blue vitriol, bluestone,[10] vitriol of copper,[11] and Roman vitriol.[12] It exothermically dissolves in water to give the aquo complex [Cu(H2O)6]2+, which has octahedral molecular geometry. The structure of the solid pentahydrate reveals a polymeric structure wherein copper is again octahedral but bound to four water ligands. The Cu(II)(H2O)4 centers are interconnected by sulfate anions to form chains.[13] Anhydrous copper sulfate is a light grey powder.
Preparation and occurrence[edit]
Preparation of copper(II) sulfate by electrolyzing sulfuric acid, using copper electrodes
Copper sulfate is produced industrially by treating copper metal with hot concentrated sulfuric acid or copper oxides with dilute sulfuric acid. For laboratory use, copper sulfate is usually purchased. Copper sulfate can also be produced by slowly leaching low-grade copper ore in air; bacteria may be used to hasten the process.[14]
Commercial copper sulfate is usually about 98% pure copper sulfate, and may contain traces of water. Anhydrous copper sulfate is 39.81% copper and 60.19% sulfate by mass, and in its blue, hydrous form, it is 25.47% copper, 38.47% sulfate (12.82% sulfur) and 36.06% water by mass. Four types of crystal size are provided based on its usage: large crystals (10–40 mm), small crystals (2–10 mm), snow crystals (less than 2 mm), and windswept powder (less than 0.15 mm).[14]
Chemical properties[edit]
Copper(II) sulfate pentahydrate decomposes before melting. It loses two water molecules upon heating at 63 °C (145 °F), followed by two more at 109 °C (228 °F) and the final water molecule at 200 °C (392 °F).[15][16]
The chemistry of aqueous copper sulfate is simply that of copper aquo complex, since the sulfate is not bound to copper in such solutions. Thus, such solutions react with concentrated hydrochloric acid to give tetrachlorocuprate(II):
- Cu2+ + 4 Cl− → [CuCl4]2−
Similarly treatment of such solutions with zinc gives metallic copper, as described by this simplified equation:[17]
- CuSO4 + Zn → Cu + ZnSO4
A further illustration of such single metal replacement reactions occurs when a piece of iron is submerged in a solution of copper sulfate:
- Fe + CuSO4 → FeSO4 + Cu
In high school and general chemistry education, copper sulfate is used as an electrolyte for galvanic cells, usually as a cathode solution. For example, in a zinc/copper cell, copper ion in copper sulfate solution absorbs electron from zinc and forms metallic copper.[18]
- Cu2+ + 2e− → Cu (cathode), E°cell = 0.34 V
Copper sulfate is commonly included in teenager chemistry sets and undergraduate experiments.[19] It is often used to grow crystals in schools and in copper plating experiments, despite its toxicity. Copper sulfate is often used to demonstrate an exothermic reaction, in which steel wool or magnesium ribbon is placed in an aqueous solution of CuSO4. It is used to demonstrate the principle of mineral hydration. The pentahydrate form, which is blue, is heated, turning the copper sulfate into the anhydrous form which is white, while the water that was present in the pentahydrate form evaporates. When water is then added to the anhydrous compound, it turns back into the pentahydrate form, regaining its blue color.[20] Copper(II) sulfate pentahydrate can easily be produced by crystallization from solution as copper(II) sulfate, which is hygroscopic.
Uses[edit]
As a fungicide and herbicide[edit]
Copper sulfate has been used for control of algae in lakes and related fresh waters subject to eutrophication. It «remains the most effective algicidal treatment».[21][22]
Bordeaux mixture, a suspension of copper(II) sulfate (CuSO4) and calcium hydroxide (Ca(OH)2), is used to control fungus on grapes, melons, and other berries.[23] It is produced by mixing a water solution of copper sulfate and a suspension of slaked lime.
A dilute solution of copper sulfate is used to treat aquarium fishes for parasitic infections,[24] and is also used to remove snails from aquariums and zebra mussels from water pipes.[25] Copper ions are highly toxic to fish. Most species of algae can be controlled with very low concentrations of copper sulfate.
Analytical reagent[edit]
Several chemical tests utilize copper sulfate. It is used in Fehling’s solution and Benedict’s solution to test for reducing sugars, which reduce the soluble blue copper(II) sulfate to insoluble red copper(I) oxide. Copper(II) sulfate is also used in the Biuret reagent to test for proteins.
Copper sulfate is used to test blood for anemia. The blood is dropped into a solution of copper sulfate of known specific gravity—blood with sufficient hemoglobin sinks rapidly due to its density, whereas blood which sinks slowly or not at all has an insufficient amount of hemoglobin.[26] Clincally relevant, however, modern laboratories utilize automated blood analyzers for accurate quantitative hemoglobin determinations, as opposed to older qualitative means.[citation needed]
In a flame test, the copper ions of copper sulfate emit a deep green light, a much deeper green than the flame test for barium.
Organic synthesis[edit]
Copper sulfate is employed at a limited level in organic synthesis.[27] The anhydrous salt is used as a dehydrating agent for forming and manipulating acetal groups.[28] The hydrated salt can be intimately mingled with potassium permanganate to give an oxidant for the conversion of primary alcohols.[29]
Rayon production[edit]
Reaction with ammonium hydroxide yields tetraamminecopper(II) sulfate or Schweizer’s reagent which was used to dissolve cellulose in the industrial production of Rayon.
Niche uses[edit]
Copper(II) sulfate has attracted many niche applications over the centuries. In industry copper sulfate has multiple applications. In printing it is an additive to book-binding pastes and glues to protect paper from insect bites; in building it is used as an additive to concrete to improve water resistance and discourage anything from growing on it. Copper sulfate can be used as a coloring ingredient in artworks, especially glasses and potteries.[30] Copper sulfate is also used in firework manufacture as a blue coloring agent, but it is not safe to mix copper sulfate with chlorates when mixing firework powders.[31]
Lowering a copper etching plate into the copper sulfate solution
Copper sulfate was once used to kill bromeliads, which serve as mosquito breeding sites.[32] Copper sulfate is used as a molluscicide to treat bilharzia in tropical countries.[30]
Art[edit]
In 2008, the artist Roger Hiorns filled an abandoned waterproofed council flat in London with 75,000 liters of copper(II) sulfate water solution. The solution was left to crystallize for several weeks before the flat was drained, leaving crystal-covered walls, floors and ceilings. The work is titled Seizure.[33] Since 2011, it has been on exhibition at the Yorkshire Sculpture Park.[34]
Etching[edit]
Copper(II) sulfate is used to etch zinc, aluminium, or copper plates for intaglio printmaking.[35][36]
It is also used to etch designs into copper for jewelry, such as for Champlevé.[37]
Dyeing[edit]
Copper(II) sulfate can be used as a mordant in vegetable dyeing. It often highlights the green tints of the specific dyes.[citation needed]
Electronics[edit]
An aqueous solution of copper(II) sulfate is often used as the resistive element in liquid resistors.[citation needed]
In electronic and microelectronic industry a bath of CuSO4·5H2O and sulfuric acid (H2SO4) is often used for electrodeposition of copper.[38]
Other forms of copper sulfate[edit]
Anhydrous copper(II) sulfate can be produced by dehydration of the commonly available pentahydrate copper sulfate. In nature, it is found as the very rare mineral known as chalcocyanite.[39] The pentahydrate also occurs in nature as chalcanthite. Other rare copper sulfate minerals include bonattite (trihydrate),[40] boothite (heptahydrate),[41] and the monohydrate compound poitevinite.[42][43] There are numerous other, more complex, copper(II) sulfate minerals known, with environmentally important basic copper(II) sulfates like langite and posnjakite.[43][44][45]
Forms of copper(II) sulfate
-
Anhydrous CuSO4
-
Copper(II) sulfate monohydrate
-
Copper(II) sulfate pentahydrate
-
The rare mineral boothite (CuSO4·7H2O)
Toxicological effects[edit]
Copper(II) salts have an LD50 of 100 mg/kg.[46][47] It is harmless enough to be a routine component of high school experiments and to be used widely in swimming lakes to control algae.
Copper(II) sulfate was used in the past as an emetic.[48] It is now considered too toxic for this use.[49] It is still listed as an antidote in the World Health Organization’s Anatomical Therapeutic Chemical Classification System.[50]
See also[edit]
- Chalcanthum
- Vitriol
References[edit]
- ^ Varghese, J. N.; Maslen, E. N. (1985). «Electron density in non-ideal metal complexes. I. Copper sulphate pentahydrate». Acta Crystallogr. B. 41: 184–190. doi:10.1107/S0108768185001914.
- ^ a b c d e f g Haynes, p. 4.62
- ^ Haynes, p. 5.199
- ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C., eds. (2003). «Chalcocyanite» (PDF). Handbook of Mineralogy. Vol. V. Borates, Carbonates, Sulfates. Chantilly, VA, US: Mineralogical Society of America. ISBN 978-0962209741.
- ^ Haynes, p. 10.240
- ^ Kokkoros, P. A.; Rentzeperis, P. J. (1958). «The crystal structure of the anhydrous sulphates of copper and zinc». Acta Crystallographica. 11 (5): 361–364. doi:10.1107/S0365110X58000955.
- ^ Bacon, G. E.; Titterton, D. H. (1975). «Neutron-diffraction studies of CuSO4 · 5H2O and CuSO4 · 5D2O». Z. Kristallogr. 141 (5–6): 330–341. Bibcode:1975ZK….141..330B. doi:10.1524/zkri.1975.141.5-6.330.
- ^ a b c NIOSH Pocket Guide to Chemical Hazards. «#0150». National Institute for Occupational Safety and Health (NIOSH).
- ^ Cupric sulfate. US National Institutes of Health
- ^ «Copper (II) sulfate MSDS». Oxford University. Archived from the original on 2007-10-11. Retrieved 2007-12-31.
- ^ Antoine-François de Fourcroy, tr. by Robert Heron (1796) «Elements of Chemistry, and Natural History: To which is Prefixed the Philosophy of Chemistry». J. Murray and others, Edinburgh. Page 348.
- ^ Oxford University Press, «Roman vitriol», Oxford Living Dictionaries. Accessed on 2016-11-13
- ^ Ting, V. P.; Henry, P. F.; Schmidtmann, M.; Wilson, C. C.; Weller, M. T. (2009). «In situ neutron powder diffraction and structure determination in controlled humidities». Chem. Commun. 2009 (48): 7527–7529. doi:10.1039/B918702B. PMID 20024268.
- ^ a b «Uses of Copper Compounds: Copper Sulphate». copper.org. Copper Development Association Inc. Retrieved 10 May 2015.
- ^ Andrew Knox Galwey; Michael E. Green (1999). Thermal decomposition of ionic solids. Elsevier. pp. 228–229. ISBN 978-0-444-82437-0.
- ^ Wiberg, Egon; Nils Wiberg; Arnold Frederick Holleman (2001). Inorganic chemistry. Academic Press. p. 1263. ISBN 978-0-12-352651-9.
- ^ Ray Q. Brewster, Theodore Groening (1934). «P-Nitrophenyl Ether». Organic Syntheses. 14: 66. doi:10.15227/orgsyn.014.0066.
- ^ Zumdahl, Steven; DeCoste, Donald (2013). Chemical Principles. Cengage Learning. pp. 506–507. ISBN 978-1-285-13370-6.
- ^ Rodríguez, Emilio; Vicente, Miguel Angel (2002). «A Copper-Sulfate-Based Inorganic Chemistry Laboratory for First-Year University Students That Teaches Basic Operations and Concepts». Journal of Chemical Education. 79 (4): 486. Bibcode:2002JChEd..79..486R. doi:10.1021/ed079p486.
- ^ «Process for the preparation of stable copper(II) sulfate monohydrate applicable as trace element additive in animal fodders». Retrieved 2009-07-07.
- ^ Van Hullebusch, E.; Chatenet, P.; Deluchat, V.; Chazal, P. M.; Froissard, D.; Lens, P. N.L.; Baudu, M. (2003). «Fate and forms of Cu in a reservoir ecosystem following copper sulfate treatment (Saint Germain les Belles, France)». Journal de Physique IV (Proceedings). 107: 1333–1336. doi:10.1051/jp4:20030547.
- ^ Haughey, M. (2000). «Forms and fate of Cu in a source drinking water reservoir following CuSO4 treatment». Water Research. 34 (13): 3440–3452. doi:10.1016/S0043-1354(00)00054-3.
- ^ Martin, Hubert (1933). «Uses of Copper Compounds: Copper Sulfate’s Role in Agriculture». Annals of Applied Biology. 20 (2): 342–363. doi:10.1111/j.1744-7348.1933.tb07770.x. Retrieved 2007-12-31.
- ^ «All About Copper Sulfate». National Fish Pharmaceuticals. Retrieved 2007-12-31.
- ^ «With Zebra mussels here to stay, Austin has a plan to avoid stinky drinking water». KXAN Austin. 2020-10-26. Retrieved 2020-10-28.
- ^ Estridge, Barbara H.; Anna P. Reynolds; Norma J. Walters (2000). Basic Medical Laboratory Techniques. Thomson Delmar Learning. p. 166. ISBN 978-0-7668-1206-2.
- ^ Hoffman, R. V. (2001). «Copper(II) Sulfate». Copper(II) Sulfate, in Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons. doi:10.1002/047084289X.rc247. ISBN 978-0471936237.
- ^ Philip J. Kocienski (2005). Protecting Groups. Thieme. p. 58. ISBN 978-1-58890-376-1.
- ^ Jefford, C. W.; Li, Y.; Wang, Y. «A Selective, Heterogeneous Oxidation using a Mixture of Potassium Permanganate and Cupric Sulfate: (3aS,7aR)-Hexahydro-(3S,6R)-Dimethyl-2(3H)-Benzofuranone». Organic Syntheses.; Collective Volume, vol. 9, p. 462
- ^ a b Copper Development Association. «Uses of Copper Compounds: Table A — Uses of Copper Sulphate». copper. Copper Development Association Inc. Retrieved 12 May 2015.
- ^ Partin, Lee. «The Blues: Part 2». skylighter. Skylighter.Inc. Archived from the original on 21 December 2010. Retrieved 12 May 2015.
- ^ Despommier; Gwadz; Hotez; Knirsch (June 2005). Parasitic Disease (5 ed.). NY: Apple Tree Production L.L.C. pp. Section 4.2. ISBN 978-0970002778. Retrieved 12 May 2015.
- ^ «Seizure». Artangel.org.uk. Retrieved 2021-10-05.
- ^ «Roger Hiorns: Seizure». Yorkshire Sculpture Park. Archived from the original on 2015-02-22. Retrieved 2015-02-22.
- ^ greenart.info, Bordeau etch, 2009-01-18, retrieved 2011-06-02.
- ^ ndiprintmaking.ca, The Chemistry of using Copper Sulfate Mordant, 2009-04-12, retrieved 2011-06-02.
- ^ http://mordent.com/etch-howto/, How to Electrolytically etch in copper, brass, steel, nickel silver or silver, retrieved 2015-05-2015.
- ^ Copper Electrodeposition for Nanofabrication of Electronics Devices. K. Kondo, Rohan N. Akolkar, Dale P. Barkey, Masayuki Yokoi. New York. 2014. ISBN 978-1-4614-9176-7. OCLC 868688018.
{{cite book}}: CS1 maint: others (link) - ^ «Chalcocyanite». www.mindat.org.
- ^ «Bonattite». www.mindat.org.
- ^ «Boothite». www.mindat.org.
- ^ «Poitevinite». www.mindat.org.
- ^ a b «List of Minerals». www.ima-mineralogy.org. March 21, 2011.
- ^ «Langite». www.mindat.org.
- ^ «Posnjakite». www.mindat.org.
- ^ Windholz, M., ed. 1983. The Merck Index. Tenth edition. Rahway, NJ: Merck and Company.
- ^ Guidance for reregistration of pesticide products containing copper sulfate. Fact sheet no. 100., Washington, DC: U.S. Environmental Protection Agency, Office of Pesticide Programs, 1986
- ^ Holtzmann, N. A.; Haslam, R. H. (July 1968). «Elevation of serum copper following copper sulfate as an emetic». Pediatrics. 42 (1): 189–93. doi:10.1542/peds.42.1.189. PMID 4385403. S2CID 32740524.
- ^ Olson, Kent C. (2004). Poisoning & drug overdose. New York: Lange Medical Mooks/McGraw-Hill. p. 175. ISBN 978-0-8385-8172-8.
- ^ V03AB20 (WHO)
Bibliography[edit]
- Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. ISBN 978-1439855119.
External links[edit]
Media related to Copper(II) sulfate at Wikimedia Commons- International Chemical Safety Card 0751
- International Chemical Safety Card 1416
- National Pollutant Inventory – Copper and compounds fact sheet
Media related to Copper(II) sulfate at Wikimedia Commons