Surface Chemistry

The following data is obtained for coagulating a positively charged sol in 2 hours


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Conc. of $\mathrm{Cl}^{-}$in $\mathrm{mol} \mathrm{L}^{-1}$	Result
\( 5 \times 10^{-5} \)	Sol not precipitated
\( 6 \times 10^{-5} \)	Sol not precipitated
\( 7 \times 10^{-5} \)	Sol precipitated
\( 8 \times 10^{-5} \)	Sol precipitated
\( 1 \times 10^{-4} \)	Sol precipitated

What is the coagulating value of electrolyte for this sol?