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  • Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6.  If ionisation constant of HA is 10−5, the ratio of salt to acid concentration in the buffer solution will be : Option: 1</stron

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6.  If ionisation constant of HA is 10−5, the ratio of salt to acid concentration in the buffer solution will be :
Option: 1  4 : 5
Option: 2 1 : 10
Option: 3  10 : 1
Option: 4  5 : 4  
 

Answers (1)

best_answer

As we learnt,

\mathrm{pH=pKa+\log \frac{[\text {salt}]}{[\text {acid}]}}

\therefore \mathrm{6=5+\log \frac{[\text {salt}]}{[\text {acid}]}}

\Rightarrow \mathrm{\log \frac{[\text {salt}]}{[\text {acid}]}=1}

\Rightarrow \mathrm{\frac{[\text {salt}]}{[\text {acid}]}=10}

Hence, the correct answer is Option (3)

Posted by

vishal kumar

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