A) \[3\times {{10}^{-1}}\]
B) \[1\times {{10}^{-3}}\]
C) \[1\times {{10}^{-5}}\]
D) \[1\times {{10}^{-7}}\]
Correct Answer: C
Solution :
\[HQ\,\,\,\,\overset{{}}{leftrightarrows}\,\,\,{{H}^{+}}+{{Q}^{-}}\] \[0.1\] \[0.1-x\] \[x\] \[x\] \[pH=3,\,\,[{{H}^{+}}]={{10}^{-3}}\], \[x={{10}^{-3}}\] \[{{K}_{a}}=\frac{(x)\times (x)}{(0.1-x)}=\frac{{{({{10}^{-3}})}^{2}}}{0.1-{{10}^{-3}}}\simeq \frac{{{10}^{-6}}}{0.1}={{10}^{-5}}\]You need to login to perform this action.
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