MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions

What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2? (AIPMT 2009)

A.0.40 M

B.0.0050 M

C.0.12 M

D.0.10 M✓ Correct

Explanation

Millimoles of H+ produced = 20 x 0.05 = 1 Millimoles of OH- produced = 30 x 0.1 x 2 = 6 ( Each Ba (OH)2 gives 2OH-) Millimoles of OH- remaining in solution = 6 1 = 5 Total volume of solution = 20 + 30 = 50 mL 5 OH 0.1M 50

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