# What are the chemistry solubility rules?

Jun 17, 2017

$\text{Well, all halides are soluble...........}$, and there has to be an exception.

#### Explanation:

These are the general rules for assessing solubilities in aqueous solution:

$\text{All the salts of the alkali metals and ammonium are soluble.}$

$\text{All nitrates, and perchlorates are soluble.}$

$\text{All halides are soluble EXCEPT for}$  AgX, Hg_2X_2, PbX_2".

$\text{All sulfates are soluble EXCEPT for}$ $P b S {O}_{4} , B a S {O}_{4} , H g S {O}_{4}$.

$\text{All carbonates and hydroxides are insoluble.}$

$\text{All sulfides are insoluble.}$

The given rules follow a hierarchy. Alkali metal and ammonium salts tend to be soluble in all circumstances. The one exception to this rule is K^(+)""^(-)BPh_4 and NH_4^(+)""^(-)BPh_4, both of which are as soluble as bricks. Na^(+)""^(-)BPh_4 is sold as \text{kalignost}, i.e. $\text{potassium recognizer.}$

Of course, we refer to aqueous solution.