MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions
A buffer solution is prepared in which the concentration of NH3 is 0.30 M and the concentration of NH is 0.20 M. If the equilibrium constant, Kb for NH3 equal 1.8 x 105, what is the pH of this solution? (log 2.7 = 0.43) (AIPMT 2011)
A.9.08
B.9.43✓ Correct
C.11.73
D.8.73
Explanation
5 3 4 5 b b NH 0.30M, 1.8 10 NH 0.20M pK = log 1.8 10 4.74 salt 0.2 pOH pK log 4.74 log 4.56 base 0.3 pH= 14 4.56 9.44 x x b K
Practice More Like This
Take chapter-wise tests, track your progress, and master Ionic equilibrium.
Start Free Practice →