Chemistry

Ag2S is an insoluable black solid. Would more solid dissolve, or precipitate once the following are added to the solution.

1. KS-----I know [S] increases, shift to reactants side, precipitate

2. HClO

3. LiOH

4. NH4OH

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  1. First, note the correct spelling (and it may affect your pronunciation, too) of insoluble.
    Ag2S ==> 2Ag^+ + S^2-

    1. right. K2S increases S, shifts to the left and more ppt forms.
    2. HClO. Increases H^+ which reacts with S^2- (as in S^2- + H^+ ==> HS^-) and you should recognize HS^- as the intermediate in H2S which is a weak acid. Therefore, adding H^+ DECREASES S^2- due to the formation of HS^- and more Ag2S will dissolve (shift to the right).
    3. LiOH. You can go through the reasoning but obviously this is the opposite of 2.
    4. NH4OH. Technically, NH4OH doesn't exist, it really is NH3 + H2O. At any rate, NH3 + Ag^+ forms Ag(NH3)2^+, that decreases the Ag^+ and that shifts the reaction to the right and more Ag2S dissolves.

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