Question

You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?

• A. A physical reaction
• B. A redox reaction
• C. A precipitation reaction
• D. An acid base reaction

Answer 1

Answer: (C)

A precipitation reaction

When two solutions are mixed and the mixture becomes cloudy, it suggests the formation of an insoluble substance. The chemical reaction that occurs here is a precipitation reaction and the insoluble substance formed is called precipitate. This is an example of a double displacement reaction.

For example:

$N{a}_{2}S{O}_4+BaC{l}_2\to BaS{O}_4+2NaCl$

In this reaction, $BaS{O}_4$ is the precipitate.