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  • The pH of 0.1M HA solution is 2. What is the degree of dissociation (  ) of HA?, given, If HA is a

The pH of 0.1M HA solution is 2. What is the degree of dissociation ( \alpha ) of HA?,
given, If HA is a weak acid.

Option: 1

0.8


Option: 2


0.46


Option: 3

0.4


Option: 4

0.1


Answers (1)

best_answer

\begin{array}{l}{\text {As } \mathrm{pH}=2} \\ {\text {So }\left[\mathrm{H}^{+}\right]=10^{-2} \mathrm{M}} \\ {\mathrm{HA} \quad=\quad \mathrm{H}^{+}+\mathrm{A}^{-}} \\ {\mathrm{C} \text { mol } \mathrm{L}^{-1}} \\ {\mathrm{C}(1-\alpha) \quad \mathrm{Ca} \quad \mathrm{C} \alpha} \\\\ {\left[\mathrm{H}^{+}\right]=\mathrm{C} \alpha} \\\\ {\alpha=\left[\mathrm{H}^{+}\right] / \mathrm{C}=10^{-2} / 10^{-1}} \\ {=10^{-1}=0.1 \mathrm{M}}\end{array}

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SANGALDEEP SINGH

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