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What is formed when an excess amount of sodium hydroxide is added to a solution of stannous chloride?

1. Sn(OH)2
2. SnO2 and H2O
3. Na2SnO2
4. No reaction occurs

Correct answer: Na2SnO2

Solution

SnCl2 first gives Sn(OH)2, which is amphoteric and dissolves in excess NaOH to form sodium stannite, Na2SnO2 (i.e. Na2[Sn(OH)4]). The product is Na2SnO2, not SnO2 + H2O, so option index 2 is correct.

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