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  • The pH of 0.1 M Na2HPO4 and 0.2 M NaH2PO4 are respectively: pKa for H3PO4 are 2.2, 7.2 and 12

The pH of 0.1 M Na2HPO4 and 0.2 M NaH2PO4 are respectively:
pKa for H3PO4 are 2.2, 7.2 and 12.0.

Option: 1

5.6, 4.7


Option: 2

10, 4.7


Option: 3

4.7, 10


Option: 4

9.6, 4.7


Answers (1)

best_answer

\begin{array}{l}{\text { For } \mathrm{Na}_{2} \mathrm{HPO}_{4}, \mathrm{{pH}=\frac{p K_{a_{2}}+p K_{a_{3}}}{2}=\frac{7.28+12}{2}=9.6}} \\\\ {\text { For } \mathrm{Na}_{2} \mathrm{HPO}_{4},\mathrm{{pH}=\frac{p K_{a_{1}}+p K_{a_{3}}}{2}=\frac{2.2+7.2}{2}=4.7}}\end{array}

Therefore, option(4) is correct.

Posted by

Ritika Jonwal

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