MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryIonic equilibriumPrevious Year Questions

What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH? (Ka for CH3COOH = 1.8 x 10-5) (AIPMT 2010)

A.3.5 x 10-4

B.1.1 x 10-5

C.1.8 x 10-5

D.9.0 x 10-6✓ Correct

Explanation

- 3 3 - + 3 3 0.2M 0.2 M 0.2M CH COOH CH COO H CH COONa CH COO Na x C x x -> 3 3 aceticacidis a weak acid so, CH COOH C 0.1M dissociation is CH COO 0.2 0.2M minimum i.e., x can be neglected. x x 3 3 5 1 6 1 CH COOH H CH COO 1.8 10 10 9 10 M 2 10 a K x x x x IONIC EQUILIBRIUM 55

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