A solution which is 1 0 - 3 M each in M n 2 + , F e 2 + , Z n 2 + and H g 2 + is treated with 1 0 - 16 M sulphide ion. If K s p of M n S , FeS, ZnS and HgS are 1 0 - 13 , 1 0 - 18 , 1 0 - 24 and 1 0 - 53 respectively. Which one will precipitate first?

Question

A solution which is 1 0 - 3 M each in M n 2 + , F e 2 + , Z n 2 + and H g 2 + is treated with 1 0 - 16 M sulphide ion. If K s p of M n S , FeS, ZnS and HgS are 1 0 - 13 , 1 0 - 18 , 1 0 - 24 and 1 0 - 53 respectively. Which one will precipitate first?, FeS, MgS, HgS, ZnS

MARKS App · Accepted Answer

[ S 2 - ] needed for precipitation of F e S = 1 0 - 18 1 0 - 3 = 1 0 - 15 M M n S = 1 0 - 13 1 0 - 3 = 1 0 - 10 M H g S = 1 0 - 53 1 0 - 3 = 1 0 - 50 M Z n S = 1 0 - 24 1 0 - 3 = 1 0 - 21 M Thus, minimum [ S 2 - ] is for HgS and so it will be precipitated first.

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