Equilibrium - Result Question 61

####63. A weak acid, HA, has a Ka of 1.00×105. If 0.100mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilbrium is closest to

(a) 1.00

(b) 99.9

(c) 0.100

(d) 99.0

[2007]

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Solution:

  1. (a) Given Ka=1.00×105,C=0.100mol for a weak electrolyte, degree of dissociation

α=KaC1×1050.100=102=1



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