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Question

# Which of the following solution when added to 1L of 0.1 M CH3COOH solution will cause no change either in the degree of dissociation of CH3COOHor in the pH of the solution . Ka=1.8×10−5 for CH3COOH?

A
3 mM HCOOH (Ka=6×104)
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B
0.1MCH3COONa
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C
1.34mMHCI
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D
0.1MCH3COOH
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Solution

## The correct options are A 3 mM HCOOH (Ka=6×10−4) C 1.34mMHCI D 0.1MCH3COOHGiven , Ka=1.8×105C=0.1First calculate the hydrogen ion concentration in 0.1 M CH3COOH solution. [H+]=√Ka×C=√1.8×105×0.1=1.34×10−3It is the concentration range of hydrogen ion above which pH will change.The solutions in options A, C and D provide same hydrogen ion concentration.Thus when these solutions are added, they will neither affect the degree of dissociation of CH3COOHnor they will affect the pH of the solution.

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