Description

Synonyms: Zinc Sulfate
CAS Number: ********0 &********0, Molecular Weight: **7.*4, Chemical Formula: ZnSO4·7H2O, EINECS EC Number: ********3

Zinc Sulphate Heptahydrate BP Grade
ZnSO4,7H2O *- **7.5 *- ********0

DEFINITION
Content: *9.0 per cent to **4.0 per cent Zinc Sulphate Heptahydrate ( Zinc Sulfate Heptahydrate ).

CHARACTERS
Appearance: White or almost white, crystalline powder or colourless, transparent crystals, efflorescent.
Solubility: Very soluble in water, practically insoluble in alcohol.

IDENTIFICATION
A. Solution S (see Tests) gives the reactions of sulphates.
B. Solution S gives the reaction of zinc.
C. It complies with the limits of the assay.

TESTS
Solution S: Dissolve 2.5 g in carbon dioxide-free water and dilute to *0 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: 4.4 to 5.6 for solution S.
Chlorides: Maximum **0 ppm.
Iron: Maximum **0 ppm.

Zinc Sulphate Hexahydrate BP Grade
ZnSO**6H2Oi *- **9.5 *- *********8

DEFINITION
Content: *9.0 per cent to **4.0 per cent Zinc Sulphate Hexahydrate ( Zinc Sulfate Hexahydrate ).

CHARACTERS
Appearance: White or almost white, crystalline powder or colourless transparent crystals, efflorescent.
Solubility: Very soluble in water, practically insoluble in alcohol.

IDENTIFICATION
A. Solution S (see Tests) gives the reactions of sulphates.
B. Solution S gives the reaction of zinc.
C. It complies with the limits of the assay.

TESTS
Solution S: Dissolve 2.5 g in carbon dioxide-free water and dilute to *0 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: 4.4 to 5.6 for solution S.
Chlorides: Maximum **0 ppm.
Iron: Maximum **0 ppm.

Zinc Sulphate Monohydrate BP Grade
ZnSO*-H2O *- **9.5 *- ********7

DEFINITION
Content: *9.0 per cent to **1.0 per cent.

CHARACTERS
Appearance: White or almost white, crystalline powder, or colourless, transparent crystals.
Solubility: Very soluble in water, practically insoluble in ethanol (*6 per cent).

IDENTIFICATION
A. Solution S (see Tests) gives the reactions of sulphates.
B. Solution S gives the reaction of zinc.
C. It complies with the limits of the assay.

TESTS
Solution S: Dissolve 2.5 g in carbon dioxide-free water R and dilute to *0 ml with the same solvent.
Appearance of solution: Solution S is clear and colourless.
pH: 4.4 to 5.6 for solution S.
Chlorides: Maximum **0 ppm.
Iron: Maximum **0 ppm.

Zinc Sulfate USP Grade
ZnSO*-xH2O
Sulfuric acid, zinc salt (1:1), hydrate.
Zinc sulfate (1:1) monohydrate **9.*6
Zinc sulfate (1:1) heptahydrate **7.*6 [********0]
Anhydrous **1.*6 [********0]

Zinc Sulfate contains one or seven molecules of water of hydration. The monohydrate contains not less than *9.0 percent and not more than *0.4 percent of ZnSO4, corresponding to not less than *9.0 percent and not more than **0.5 percent of ZnSO4·H2O, and the heptahydrate contains not less than *5.6 percent and not more than *1.0 percent of ZnSO4, corresponding to not less than *9.0 percent and not more than **8.7 percent of ZnSO4·7H2O.

Identification— A solution of it responds to the tests for Zinc and for Sulfate.
Acidity— A solution containing the equivalent of *8 mg of ZnSO4 per mL is not colored pink by methyl orange TS.
Arsenic— the limit is *4 ppm.
Lead— The lead limit is 0.**2%.
Alkalies and alkaline earths— Dissolve the equivalent of 1.*2 g of ZnSO4 in about **0 mL of water contained in a ***-mL volumetric flask. Precipitate the zinc completely by means of ammonium sulfide TS, and dilute with water to volume. Mix, and filter through a dry filter, rejecting the first portion of the filtrate. To **0 mL of the subsequent filtrate add a few drops of sulfuric acid, evaporate to dryness in a tarred dish, and ignite: the weight of the residue does not exceed 5 mg (0.9%).

Zinc Sulfate FCC Food Grade
ZnSO4·H2O Formula wt, monohydrate **9.*5
ZnSO4·7H2O Formula wt, heptahydrate **7.*4
CAS: monohydrate [********7]
CAS: heptahydrate [********0]

DESCRIPTION
Zinc Sulfate occurs as colorless, transparent prisms or small needles, or as a granular, crystalline powder. It contains one or seven molecules of water of hydration. The monohydrate loses water at temperatures above **8°; the heptahydrate effloresces in dry air at room temperature. Its solutions are acid to litmus. The monohydrate is soluble in water and practically insoluble in alcohol. One gram of the heptahydrate dissolves in about 0.6 mL of water and in about 2.5 mL of glycerin; it is insoluble in alcohol.
Function: Nutrient.

REQUIREMENTS
Identification: A 1:*0 aqueous solution gives positive tests for Zinc and for Sulfate.
Assay: Monohydrate: Not less than *8.0% and not more than **0.5% of ZnSO4·H2O; Heptahydrate: Not less than *9.0% and not more than **8.7% of ZnSO4·7H2O.
Acidity: Passes test.
Alkalies and Alkaline Earths: Not more than 0.5%.
Cadmium: Not more than 2 mg/kg.
Lead: Not more than 4 mg/kg.
Mercury: Not more than 5 mg/kg.
Selenium: Not more than 0.**3%.

Zinc Sulfate ACS Analytical Reagent
Zinc Sulfate Heptahydrate
ZnSO4 . 7H2O
Formula Wt **7.*6
CAS Number ********0

REQUIREMENTS

MAXIMUM ALLOWABLE