Copper Sulfate

Copper Sulphate Pentahydrate BP Grade Ph Eur

CuSO4-5H2O --- 249.7 --- 7758-99-8

DEFINITION
Content: 99.0 per cent to 101.0 per cent.

CHARACTERS
Appearance: Blue, crystalline powder or transparent, blue crystals.
Solubility: Freely soluble in water, soluble in methanol, practically insoluble in ethanol (96 per cent).

IDENTIFICATION
A. Add several drops of dilute ammonia to 1 ml of solution S (see Tests). A blue precipitate is formed. On further addition of dilute ammonia the precipitate dissolves and a dark blue colour is produced.
B. Loss on drying (see Tests).
C. Dilute 1 ml of solution S to 5 ml with water. The solution gives reaction of sulphates.

TESTS
Solution S: Dissolve 5 g in water and dilute to 100 ml with the same solvent.
Appearance of solution: Solution S is clear.
Chlorides: Maximum 100 ppm.
Iron: Maximum 1.00 × 102 ppm.
Atomic absorption spectrometry: To meet the requirement.
Lead: Maximum 50.0 ppm.
Loss on drying: 35.0 per cent to 36.5 per cent, determined on 0.500 g by drying in an oven at 250 ± 10 °C.

Cupric Sulfate Cupric Sulfate USP Grade

CuSO45H2O --- 249.69
Sulfuric acid, copper(2+) salt (1:1), pentahydrate.
Copper(2+) sulfate (1:1) pentahydrate [7758-99-8].
Anhydrous 159.61 [7758-98-7].
Cupric Sulfate, dried at 250 to constant weight, contains not less than 98.5 percent and not more than 100.5 percent of CuSO4.

Identification: A solution (1 in 10) responds to the tests for Copper and for Sulfate.
Loss on drying: Dry it at 250 to constant weight: it loses between 33.0% and 36.5% of its weight.
Limit of sodium: The limit is 0.02%.
Limit of potassium: The limit is 0.01%.
Limit of calcium: The limit is 0.005%.
Limit of iron: The limit is 0.003%.
Limit of nickel: The limit is 0.005%.