Faktor Van't Hoff

Kadar perak nitrat dalam larutan = 10%, maka dapat diasumsikan:

massa zat terlarut (perak nitrat) = 10 gram

massa pelarut (air) = 90 gram

\(\ce{AgNO3 -> Ag+ + NO3-}\)

Faktor Van't Hoff:

\begin{equation*}
\begin{split}
i & = 1 + (n - 1) \:.\: \alpha \\\\
i & = 1 + (2 - 1) \:.\: 0,35 \\\\
i & = 1,35
\end{split}
\end{equation*}

Penurunan tekanan uap jenuh

\begin{equation*}
\begin{split}
\Delta P & = x_{t} \:.\: P^o \\\\
\Delta P & = \frac {n_t \:.\: i}{n_t \:.\: i + n_p} \:.\: P^0 \\\\
\Delta P & = \frac {\dfrac {10}{170} \:.\: 1,35}{\dfrac {10}{170} \:.\: 1,35 + \dfrac {90}{18}} \:.\: 51 \\\\
\Delta P & = \frac {0,079}{0,079 + 5} \:.\: 51 \\\\
\Delta P & = \frac {4,05}{5,079} \\\\
\Delta P & = 0,8
\end{split}
\end{equation*}

Tekanan uap jenuh larutan = 51 − 0,8 = 50,2 mmHg.