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50 ml of 0.1 M solution of sodium acetat...

50 ml of 0.1 M solution of sodium acetate and 50 ml of 0.01 M acetic acid are mixed . The `pKa` of acetic acid is 4.76 The ` P^(H) ` of the buffer solution is

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Number of milliequivalents of acid `= 20 xx 0.2 = 2`
Number of milliequivalents of salt `= 40 xx 0.1 = 4`
` pH =pK_a +log ""(["Salt"])/("[acid]")=4.8 + log = 4.8 + 0.3 = 5.1`
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