Answer to Question #109840 in Chemistry for sonia

Question

A 3.0 g sample of an alloy containing lead and tin is dissolved in nitric acid. An excess of
sulfuric acid is then added to the mixture, resulting in the formation of 2.37 g of a precipitate.
Identify the precipitate which is being formed.

Answer 1

Under the action of dilute acids, in both cases, the metal nitrate is formed first, and then its sulfate.Lead sulfate is known to precipitate, tin sulfates are hydrolyzed or soluble.

In concentrated acids, the process goes through the formation of a hydrated oxide for tin and (or tinic acid), lead reacts as well.

This pricipitate PbSO4.