Practice Precipitation Reaction in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

A double displacement reaction that produces an insoluble solid (precipitate) when two aqueous solutions are mixed.

Mix two clear solutions and a solid appears 'out of nowhere' — the ions combine to form a compound that won't dissolve.

Example 1

easy
Define a precipitation reaction. When solutions of \text{AgNO}_3 and \text{NaCl} are mixed, a white solid forms. Identify the precipitate and write the balanced equation.

Example 2

medium
Predict whether a precipitate forms when solutions of \text{Pb(NO}_3)_2 and \text{KI} are mixed. If so, identify the precipitate and write the balanced equation. Use solubility rules: most iodides are soluble, but \text{PbI}_2 is insoluble.

Example 3

medium
Will a precipitate form when \text{Na}_2\text{SO}_4\text{(aq)} is mixed with \text{BaCl}_2\text{(aq)}? Write the equation if a reaction occurs. (Solubility rule: \text{BaSO}_4 is insoluble.)

Example 4

hard
A forensic chemist tests a solution suspected of containing \text{Pb}^{2+} ions by adding \text{Na}_2\text{CrO}_4 solution. A yellow precipitate forms. Write the balanced molecular equation, identify the precipitate, and explain how this confirms the presence of lead ions.
← Back to Precipitation Reaction Worked Examples