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) ?

1 Answer
Sep 13, 2017

Answer:

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.....