Ionic EquilibriumHard
Question
Which of the following solutions when added to 1L of a 0.01 M CH3COOH solution will cause no change in the degree of dissociation of CH3COOH and pH of the solution ? Ka = 1.6 × 10-5 for CH3COOH?
Options
A.0.6 mM HCOOH (Ka = 8 × 10-4)
B.0.1 M CH3COONa
C.0.4 mM HCl
D.0.01 M CH3COOH
Solution
(A) In 0.6 m M HCOOH solution
Ka =
⇒ 8 × 10-4 = 
[H+] = 4 × 10-4 M.
So solution in (A), (C) & (D) are ISOHYDRIC.
Ka =
⇒ 8 × 10-4 = [H+] = 4 × 10-4 M.
So solution in (A), (C) & (D) are ISOHYDRIC.
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