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How to Break a Tin Gel

A solution of HCl containing about 6% tin as tin tetrachloride is being neutralized with caustic. When a pH of 3 is reached the solution becomes a heavy gel which at pH 7 occupies about 50% of the volume. Upon increasing the pH to 12-14 the gel dissolves and upon re-neutralizing to pH 7 all returns. How can this dispersion be broken? Help!

Pero Dukleski
environmental services - Valparaiso, IN, U.S.A.
2006

Stannous chloride occurs when treating tin with hydrochloric acid. It is soluble in water, but not in acid (hence, insoluble in water below pH 7, which is technically an "acid"). All you can do is keep the pH up to keep it in solution. It has many uses in industry if you make enough of it.

Paul Morkovsky
- Shiner, Texas, USA
2006

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