# What type of reaction produces a precipitate?

May 24, 2016

See below..

#### Explanation:

SO SORRY FOR LONG EXPLANATION - but I'm trying to make stuff clear.

Precipitate can be formed when non-soluble substance forms a solid product in a chemical reaction.

How to predict Precipitate?
To determine if a precipitate will form you should know the ions involved and be able to apply the solubility rules.

These are the solubility rules:
1) Group 1 metals on periodic table - all soluble
2) Nitrates ($N {O}_{3}^{-}$) - all soluble
3) Chlorides ($C l -$) - all soluble EXCEPT $A g C l$ and $P b C {l}_{2}$.
4) Sulfates ($S {O}_{4}^{-} 2$) - all soluble EXCEPT $B a S {O}_{4}$,$P b S {O}_{4}$, and $C a S {O}_{4}$.
5) Hydroxides ($O {H}^{-}$) - all NOT soluble EXCEPT $K O H$and $N a O H$.
6) Carbonates ($C {O}_{3}^{-} 2$) - all NOT soluble EXCEPT ${K}_{2} C {O}_{3}$, $N {a}_{2} C {O}_{3}$, and ${\left(N {H}_{4}\right)}_{2} C {O}_{3}$.

Let's say sodium chloride (NaCl) and lead nitrate ($P b {\left(N {O}_{3}\right)}_{2}$) are given to you to mix them together.

$2 N a C l + P b {\left(N {O}_{3}\right)}_{2} \implies 2 N a N {O}_{3} + P b C {l}_{2}$

$N a N {O}_{3}$ is soluble (rule 1 and 2)
$P b C {l}_{2}$ is Not soluble (rule 3)

Since $P b C {l}_{2}$ is insoluble, therefore it will form a precipitate.

This is what precipitate looks like