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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