Vi vill beräkna koncentrationen kloridjoner:
\[[\mathrm{Cl^-}] = \frac {n_\mathrm{Cl^-}}{V}\]
Vid analysen bildas bildas fast silverklorid, AgCl(s):
Ag+(aq) + Cl–(aq) → AgCl(s)
Substansmängden kloridjoner beräknas:
\[\begin{aligned} n_\mathrm{Cl^-}:n_\mathrm{AgCl} &= 1:1 \\ n_\mathrm{Cl^-} &= n_\mathrm{AgCl} = \frac {m_\mathrm{AgCl}}{M_\mathrm{AgCl}} = \frac {0,253\mathrm{g}}{(107,9 + 35,45)\mathrm{g/mol}} = \\ &= 0,00176491\mathrm{mol} \end{aligned}\]
Koncentrationen kloridjoner beräknas:
\[\begin{aligned} \mathrm{[Cl^-]} &= \frac {0,00176491\mathrm{mol}}{0,250\mathrm{dm^3}} = 0,00705964\mathrm{mol/dm^3} ≈ \\ &≈ 0,00706\mathrm{mol/dm^3} = 7,06 \cdot 10^{-3}\mathrm{mol/dm^3}\end{aligned}\]
