pH Garam

Reaksi hidrolisis

\(\ce{Reaksi ion: Ca(CH3COO)2 -> Ca^{2+} + 2 CH3COO-}\)

\(\ce{Reaksi hidrolisis: Ca^{2+} + H2O} \cancel {\rightarrow}\)

\(\ce{Reaksi hidrolisis: CH3COO- + H2O <--> CH3COOH + OH-}\)

Reaksi hidrolisis menghasilkan ion \(\ce{OH-}\) sehingga garam bersifat basa.

Nilai pH

\begin{equation*}
\begin{split}
\ce{[OH-]} & = \sqrt{\frac {Kw \:.\: M}{Ka}} \\\\
\ce{[OH-]} & = \sqrt{\frac {10^{-14} \:.\: 0,1 \:.\: 2}{10^{-5}}} \\\\
\ce{[OH-]} & = \sqrt{2} \:.\: 10^{-5} \\\\
\ce{pOH} & = 5 - \log \sqrt{2} \\\\
\ce{pH} & = 14 - (5 - \log \sqrt{2}) \\\\
\ce{pH} & = 9 + \log \sqrt{2}
\end{split}
\end{equation*}