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tin iv sulfate formula
There is an electrolytic process for producing bivalent tin sulfate in the presence of a relatively high concentration of sulfuric acid. The process is characterized by the following:
Two electrodes made of metallic tin are used in the anode and cathode space of each circuit and are not dissolved in any foreign carrier material. A diaphragm made of an inorganic, ceramic material which has been densified by sintering at above 1,000deg C separates the anode and cathode spaces.
A tin solution is formed in the anode space which contains a relatively high concentration of tin sulfate as well as a relatively low concentration of tin (IV) compounds. This is due to the fact that, in addition to tin sulfate, the oxidation state of the metal is also reduced to a quadravalent form and that the solubility of tin (IV) in dilute sulfuric acid decreases rapidly with increasing concentration.
The tin solution is then electrolyzed and, after the electrode polarity reversal is effected, the tin is deposited to a slight extent at the cathode and to a slightly less extent at the anode. Slight amounts of anode sludge are also formed in the anode space.
By means of this electrolytic procedure, tin sulfate solutions can be produced which are very pure and are therefore highly suitable for galvanic tinning of household articles, printed circuits, electrical articles and consumer articles, such as screws, can openers and the like.