A) \[8.73\]
B) \[8.32\]
C) \[6.73\]
D) \[6.32\]
Correct Answer: B
Solution :
\[HCO_{3}^{-}\] is proton acceptor as well as proton donor and therefore it is amphiprotic. For such case,\[pH=\frac{p{{k}_{1}}+p{{k}_{2}}}{2}\] \[HCO_{3}^{-}\]undergoes hydrolysis and form alkaline solution. \[HCO_{3}^{-}+{{H}_{2}}O{{H}_{2}}C{{O}_{3}}+O{{H}^{-}}\] \[HCO_{3}^{-}\]can also ionise to form acidic solution. \[HCO_{3}^{-}+{{H}_{2}}O{{H}_{3}}{{O}^{+}}+CO_{3}^{2-}\] \[pH\]of the salt is,\[pH=\frac{p{{k}_{1}}+p{{k}_{2}}}{2}\] \[=\frac{6.38+10.26}{2}=8.32\]
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