Question

Could someone give me a list of precipitates for the following ions : `Hg^+,Hg_2^{2+},Cr^{2+},Cr^{3+},Mn^{2+,3+,4+,5+,6+,7+},Co^{2+,3+},Ni^{2+,3+}`(the list must include the precipitate's colour too) ?

Answer 1

Are you joking? Have you not got an inorganic text?

Explanation:

There are 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"`.............

Your question is far too open-ended.....