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MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryIonic equilibriumSalt Hydrolysis

The pH of an aqueous solution of Ba(OH)2 is 10. If the Ksp of Ba(OH)2 is 1 × 10–9, then the concentration of Ba2+ ions in the solution in mol L–1 is

A.1 × 10–2
B.1 × 10–4
C.1 × 10–1✓ Correct
Explanation

Given, pH = 10. pH + pOH = 14. So, pOH = 14 – 10 = 4. pOH 4 pOH = log OH OH 10 10 >> Also given 9 sp K 10 . Now, for the reaction, 2 2 Ba OH Ba 2OH -> . Here, 2 2+ sp 2 9 2 4 2 1 K = Ba OH 10 Ba 10 Ba 10 >> >>

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