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Molecular formula: ZnSO4·7H2O
Molecular weight: 287.54
CAS NO:7733-02-0
Properties: colorless crystal. Relative density is 1.957. Easily soluble in water, insoluble in ethyl alcohol.
Uses: analytical reagent, mordant, electronic component production and pharmaceutical industry.
Standard: maximum assay of impurities is in %
| Specification/item |
Analytically pure-AR
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Chemically pure-CP
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High pure
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Assay
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≥99.5
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≥99.0
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≥99
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Clarity test
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Qualified
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Qualified
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—
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PH value
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4.4-6.0
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4.4-6.0
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4.4-6.0
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Water insoluble matter
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≤0.01
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≤0.01
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≤0.02
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Chloride (Cl)
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≤0.0005
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≤0.002
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≤0.05
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Total nitrogen (N)
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≤0.001
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≤0.002
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≤0.05
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Arsenic (As)
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≤0.00005
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≤0.0002
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≤0.0002
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Manganese (Mn)
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≤0.0003
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≤0.001
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-
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Iron (Fe)
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≤0.0005
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≤0.002
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≤0.002
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Copper (Cu)
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≤0.001
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≤0.005
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-
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Cadmium (Cd)
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≤0.0005
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≤0.002
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-
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Lead (Pb)
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≤0.001
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≤0.01
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≤0.01
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Non-sludging to ammonium sulfide (as sulfate)
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≤0.05
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≤0.02
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≤0.05
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Packing: woven bag lined with plastic bag, kraft paper bag, or fiber drum, net weight is 25kg.
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