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  4. The pKa HNO2 is 3.37. What is the pH of 0.01 mole/litre aqueous solution of HNO2 ?

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Q. The $ _{p}K_{a}\,HNO_{2}$ is $3.37$. What is the $pH$ of $0.01$ mole/litre aqueous solution of $HNO_{2}$ ?

Rajasthan PMTRajasthan PMT 2001

Solution:

We know that for weak acid.
$pH={}_{p}K_{w} -{}_{p}K_{a}+\log C$
$\because {}_{p}K_{w}=14$
${} _{p}K_{a}=3.37$
$C=0.01$ mole/litre
$pH=14 - 3.37 + \log 0.01$
$pH =14 -3.37-2$
$pH =8.67$