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Q. If $ {{K}_{sp}} $ for $ HgS{{O}_{4}} $ is $ 6.4\times {{10}^{-5}}, $ then solubility of its salt is:

JIPMERJIPMER 2001Equilibrium

Solution:

Given that, $ {{K}_{sp}} $ for $ HgS{{O}_{4}}=6.4\times {{10}^{-5}} $ $ HgS{{O}_{4}} $ is a binary salt, hence, for it, $ {{K}_{sp}}={{S}^{2}} $ $ \therefore $ $ S=\sqrt{{{K}_{sp}}} $ $ =\sqrt{6.4\times {{10}^{-5}}}=8\times {{10}^{-3}}\,mol\text{/}litre $