Question

Which solutes are INSOLUBLE in aqueous solution?

Answer 1

Well, many sulfides, oxides, phosphates....some sulfates, and some halides....

Explanation:

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

All the salts of the alkali metals and ammonium are soluble.

All nitrates, and perchlorates are soluble.

All halides are soluble EXCEPT for # AgX, Hg_2X_2, PbX_2"#.

All sulfates are soluble EXCEPT for `PbSO_4, BaSO_4, HgSO_4`.

All oxides, carbonates, and hydroxides are insoluble. 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`, the which has some aqueous solubility, is sold as `"kalignost"`, i.e. `"potassium recognizer"`.............