What is the pH of the solution when 0.2 mole of hydrochloric acid is added to one litre of a solution containing 1 M acetic acid and acetate ion? Assume that the total volume is one litre. Ka for CH3COOH=1.8×10−5
A
4.58
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B
9.16
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C
7
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D
2.37
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Solution
The correct option is A 4.58 On adding HCl, the free hydrogen ions combine with CH3COO− ions to form CH3COOH. Thus, the concentration of acetic acid increases while that of CH3COO− ions decreases.