Answers: 1
![\tt [H^+]=\sqrt{Ka.M}](/tpl/images/1025/7870/6afa1.png)
![\tt [H^+]=\sqrt{1.8\times 10^{-5}\times 0.839}\\\\(H^+]=0.00388=3.88\times 10^{-3}\\\\pH=3-log~3.88=2.41](/tpl/images/1025/7870/58b5a.png)
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