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A solution which is 10^-3 M each in Mn^2+, Fe^2+, Zn^2+ and Hg^2+ is treated with 10^-16 M sulphide ion. If K base sp of MnS, FeS, ZnS and HgS are 10^-15, 10^-23, 10^-20 and 10^-54 respectively, which one will precipitate first? a. FeS b. MgS c. HgS d. ZnS

A solution which is 10^-3 M each in Mn^2+, Fe^2+, Zn^2+ and Hg^2+ is treated with 10^-16 M sulphide ion. If K base sp of MnS, FeS, ZnS and HgS are 10^-15, 10^-23, 10^-20 and 10^-54 respectively, which one will precipitate first?
a. FeS
b. MgS
c. HgS
d. ZnS

Grade:12th pass

1 Answers

Kevin Nash
askIITians Faculty 332 Points
6 years ago

(c) TIPS/Formulae : For precipitation,

Ionic product > solubility product

HgS having the lowest K base sp among the given compounds will precipitate first.

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