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What is the pH of 0.1 M NaHCO3 ? K1 = 4.5 \times 10-7, K2 = 4.5 \times 10-11 for carbonic acids.(Given: log 2 = 0.3, log 3 = 0.48)

Option: 1

5.64


Option: 2

6.84


Option: 3

9.66


Option: 4

8.34


Answers (1)

best_answer

\begin{array}{l}{\mathrm{NaHCO}_{3} \quad[\mathrm{C}]=0.1 \mathrm{\: M}} \\\\ {\begin{aligned} \mathrm{pH} &=\frac{\mathrm{ p K_{1}}+ \mathrm{p K_{2}}}{2}=\frac{7-\log 4.5+11-\log 4.5}{2} \\\\ \mathrm{pH}&=\frac{18-2 \log 4.5}{2}=9-\log 4.5=9-0.66=8.34 \end{aligned}}\end{array}

Therefore, option(4) is correct

Posted by

Pankaj Sanodiya

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