MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions

At  25 °C  the dissociation  constant  of  a base,  BOH,  is 1.0×10–12. The concentration of hydroxyl ions in 0.01 M  aqueous  solution  of  the  base  would  be  (AIPMT 2005)

A.2.0×10–6mol L–1
B.1.0×10–5mol L–1
C.1.0×10–6mol L–1
D.1.0×10–7mol L–1✓ Correct
Explanation

We know that dissociation of base takes place as- BOH B OH Dissociation constant of base b K B OH / BOH At equation B OH 2 b K OH / BOH Given b K B OH / BOH 2 12 1.0 10 OH / BOH x 2 14 OH 1 10 x 2 14 7 1 OH 1 10 OH 1.0 10 molL x x

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