Equilibrium Question 313

Question: The hydrogen ion concentration of a 0.006M benzoic acid solution is (Ka=6×105) [MP PET 1994]

Options:

A) 0.6×104

B) 6×104

C) 6×105

D) 3.6×104

Show Answer

Answer:

Correct Answer: B

Solution:

Initial concentration = 0.006 M
Þ Ka=6×105 equilibrium reaction. C6H5COOHC,C(1a),,C6H5COOO,Ca,+H+,Oinitial,Ca,

Ka=Cα2

(1α1) for weak electrolyte α=KaC ; α=6×1050.006 ; α=101

,[H+]=Cα

=0.006×101

=6×104 M.



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