copper sulfate

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copper sulfate,

common name for the blue crystalline heptahydrate of cupric sulfatecupric sulfate
or copper (II) sulfate,
chemical compound, CuSO₄, taking the form of white rhombohedral crystals or amorphous powder. It decomposes at 650°C; to cupric oxide (CuO).
..... Click the link for more information. , in which copper has valence +2. It may also refer to cuprous sulfate (Cu₂SO₄), in which copper has valence +1.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Copper Sulfate

(cupric sulfate), CuSO₄; colorless crystals with a density of 3.64 g/cm³. Copper sulfate decomposes upon heating (CuSO₄ = CuO + SO₂ + ½O₂); it is readily soluble in water (23.05 g CuSO₄ per 100 g H₂O at 25°C). The bright blue pentahydrate CuSO₄ · 5H₂O is crystallized from aqueous copper sulfate solutions. Upon heating above 105°C, it converts to CuSO₄- 3H₂O (light blue color); it loses all water at 258°C. The pentahydrate occurs in nature as the mineral chalcanthite, CuSO₄ · 5H₂O.

The pentahydrate is prepared commercially by dissolving copper in heated, dilute sulfuric acid in the presence of blown air, or it can be obtained as a by-product of electrolytic copper refining. It is used in leather tanning, in the manufacture of mineral paints, and in agriculture to destroy plant pests, to control plant diseases, and in seed treatment; it is also used in galvanic cells.

copper sulfate

[′käp·ər ′səl‚fāt]

(inorganic chemistry)

cupric sulfate

References in periodicals archive ?

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Before being buried in the soil, the boards were placed in a sterile laminar flow hood and treated with a 0.13 percent solution of copper sulfate (a 0.2% solution of copper[II] sulfate pentahydrate [98+%] dissolved in distilled water) on only one face.

The effects of copper in large-scale single-fungus and dual-fungi wood systems

Others specimens with copper sulfate addition could not be subjected to 14 day observation as they had shown massive inhibition zones already at 72 hours traversing the entire diameter of the glass petri dishes which made further observation impracticable.

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The method of control commonly employed is copper sulfate, applied immediately when algae begin to multiply.

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Examples of salts are sodium chloride (NaC1), magnesium sulfate (MgSO4), and copper sulfate (CuSO4).

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Ritter also passed a current through a solution of copper sulfate, and copper appeared on the negative electrode.

Decomposition of water

Next, the researchers replace the silver solution with a copper sulfate solution and use voltage pulses from the STM to make pillars of copper near two silver piles.

STM technique yields tiniest battery

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The substances are copper sulfate, a light petroleum oil often called Volck oil or Superior oil, and lime sulfur.