Chemistry, 11.01.2021 14:00 jaylabazemore
Calculate the Ka for a 0.3 M solution of HA (unknown weak acid) if the pH = 3.65. The reaction can be modelled as HA (aq) + H2O (l) ←→ A- (aq) + H3O+ (aq).
Answers: 2
![\tt [H_3O^+]=10^{-3.65}=2.239\times 10^{-4}](/tpl/images/1025/7836/e5cf1.png)
![\tt Ka=\dfrac{[H_3O^+][A^-]}{[HA]}\\\\Ka=\dfrac{(2.239.10^{-4}){^2}}{0.3-2.239.10^{-4}}\\\\Ka=1.671\times 10^{-7}](/tpl/images/1025/7836/aafdc.png)
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Calculate the Ka for a 0.3 M solution of HA (unknown weak acid) if the pH = 3.65. The reaction can b...
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