Zinc sulfate

  • Zinc (II) -sulfate
  • Zinc vitriol
  • ZnSO4
  • ZnSO4 · 7 H2O
  • 7733-02-0 (anhydrous)
  • 7446-19-7 (monohydrate)
  • 7446-20-0 ( heptahydrate )
  • 13986-24-8 (hexahydrate )

A12CB01

Colorless, rhombohedral crystals

Fixed

  • 3.54 g · cm -3 ( anhydrous)
  • 3.2 g · cm -3 ( monohydrate)
  • 1.97 g · cm -3 ( heptahydrate )

100 ° C ( heptahydrate )

680 ° C ( decomposition)

  • Soluble in water (monohydrate: 350 g · l-1 at 20 ° C)
  • Heptahydrate: 965 g · l-1 at 20 ° C.

Risk

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Zinc sulfate ( ZnSO4 ) is the zinc salt of sulfuric acid ( trivial name: sulphate of zinc, white vitriol, copper smoke, white Galitzenstein, Augenstein, as a mineral: Goslarit ). It forms colorless crystals in the anhydrous form it is a white powder.

Production and representation

Zinc sulfate is prepared by dissolving zinc or zinc oxide in dilute sulfuric acid:

One can obtain the most heavy metal sulfates by the action of zinc, wherein the heavy metal is precipitated in elemental form. Examples are:

It is caused by oxidative weathering of sphalerite ( zinc sulphide, ZnS)

The resulting mineral ZnSO4 · 7 H2O is called Goslarit.

Properties

Zinc sulfate decomposes at temperatures above 680 ° C. Above 930 ° C remains pure zinc oxide.

It crystallizes from its aqueous solutions as zinc vitriol in colorless, rhombic crystals with seven molecules of water ( ZnSO4 · 7 H2O) ( heptahydrate ). It loses its water when heated shares and disintegrates into a white powder. Zinc sulfate in aqueous solution is due to partial hydrolysis of a weak acid reaction. Upon release of the anhydrous salt in water heating occurs when solving ZnSO4 · 7 H2O, however cooling.

It weathered surface to the air by loss of crystal water when heated and melts in its water of crystallization. It loses even at 39 ° C, a molecule of water of crystallization; at 70 ° C, only there is a water molecule, which is cleaved at 240 ° C.

Use

Zinc sulfate is used in dyeing, for wood preservation and for the production of electrolytic zinc. Due to the bactericidal effect of Zn2 ions very dilute solutions of ZnSO4 ( 0.1-0.5 %) are used as eye lotion in conjunctivitis.

One uses zinc sulfate also:

  • In the calico
  • For preserving wood and skins
  • As a flame retardant
  • As an addition to varnish to make the oil dries quickly
  • In Feuerversilberung
  • Active against herpes labialis
  • As a bactericidal agent in toothpaste

It also serves as an emetic, stains in the textile industry, trace element in fertilizers and is included in the precipitation bath in rayon production. Zinc sulphate is also used for production of zinc sulfide pigments, and other zinc compounds for the flotation of ores, the weighting of cotton, used in electroplating galvanizing.

Proof

Sodium hydroxide (NaOH ) are zinc sulfate a gelatinous precipitate of zinc hydroxide, which gives the so-called Rinmans green when moistened with a diluted cobalt salt solution and annealing.

Barium chloride forms a white precipitate of barium sulfate:

CAS registry number PubChem Anatomical Therapeutic Chemical Classification System Dangerous Substances Directive (67/548/EEC) Chemical element Electrolysis Integrated Authority File
491828
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