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Introduction to Oxidation and Reduction

Through a sol...

Question

Through a solution containing $C u^{2 +}$ and $N i^{2 +}$ , $H_{2} S$ gas is passed after adding dil HCl. Which will precipitate out and why?

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Solution

When $H_{2} S$ gas is passed after adding dilute $H C l$ due to common ion effect the ionization of H2S gas is decreased.
KSP value of copper sulphide is less than nickel sulphide because precipitation of copper sulphide requires low concentration of sulphide which is decreased by adding $H C l$ hence $N i^{+ 2}$ gets precipitated.

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