Chemical formula: ZnSO4.7H2O
Synonyms: sulphate of zinc, white vitriol
Amount: 200 g
Appearance and odour: small, white crystals without appreciable odour.
Grade: 100 % water soluble
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labeled. Bottle and cap are UN approved and reusable.
Description and uses: zinc sulphate heptahydrate is probably the most used general purpose, water soluble zinc compound and a precursor to most other zinc salts.
Precipitate as hydroxide using alkali and redissolve in relevant acid to obtain other salts of zinc. In an excess alkali the hydroxide redissolves as zincate. The hydroxide also dissolves in ammonia solution, forming a colourless zinc (II) tetra ammonium complex. This distinguishes it from aluminium which forms aluminates but not ammonia complexes.
The Daniell Cell is a textbook example of electrochemistry. A zinc anode dipped in a zinc sulphate solution and connected to a copper cathode dipped into a copper sulphate solution (the electrolytes are connected by a salt bridge to complete the circuit) provides a voltage across the electrodes of approximately 1.1 V (Volt).
Industrial uses include electroplating of zinc and as a dye mordant.
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