If $10\%$ of a $5 \times 10^{-3} \, M \, H_2CO_3$ solution dissociates,then the concentration of $H^{+}$ ions is equal to $......$.
- A$10^{-3}$
- B$10^{-2}$
- C$10^{-1}$
- D$5 \times 10^{-2}$
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