**
The ionic strength \( I \) is given by:
\[
I = \frac{1}{2} \sum c_i z_i^2
\]
For \( \mathrm{KNO}_3 \), \( c = 0.150 \, \mathrm{mol \, kg}^{-1} \), \( z_{\mathrm{K}^+} = +1 \), \( z_{\mathrm{NO}_3^-} = -1 \).
\[
I_{\text{initial}} = \frac{1}{2} \left(0.150
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