An acidified solution of 0.05 MZn2+ is saturated with 0.1 M H2S. What is the minimum molar concentration (M) of H+ required to prevent the precipitation of ZnS?

Use sp(ZnS) = 1.25 x 10-22 and overall dissociation constant of H2S,

KNET = 1 2 = 1 × 10-21.

Answer: 0.2

Chemistry 2020 JEE Advanced Paper 2 Solutions

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