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  4. Aspirin is a pain reliever with pKa=2 . Two tablets each containing 0.09 g of aspirin are dissolved in 100 mL solution. pH will be

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Q.
Aspirin is a pain reliever with $ p{{K}_{a}}=2 $ . Two tablets each containing 0.09 g of aspirin are dissolved in 100 mL solution. pH will beChemistry Question Image

ManipalManipal 2013Equilibrium

Solution:

Aspirin is a weak acid $ =0.09\times 2\text{ }g/100\text{ }mL $
$ =1.8g\,{{L}^{-1}} $ $ \frac{1.8}{180}mol\,{{L}^{-1}}=0.01\,M $ pH (weak acid)
$ =\frac{1}{2}[p{{K}_{a}}-\log C]=\frac{1}{2}(2+2)=2 $