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In an experiment, addition of 4.0 mL of 0.005 M $\mathrm{BaCl}_2$ to 16.0 mL of arsenious sulphide sol just causes complete coagulation in 2 h . The flocculating value of the effective ion is
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$\mathrm{Ba}^{2+}, 1.0$
$\mathrm{As}_2 \mathrm{~S}_3$ sol is negatively charged owing to preferential adsorption of $\mathrm{S}^{2-}$ ions. Cation would be effective in causing coagulation.
Flocculating value $=$ minimum millimole of the effective ion per litre of sol
$=\frac{4 \times 0.005}{(4+16) \times 10^{-3}}=1.0$
Flocculating value $=$ minimum millimole of the effective ion per litre of sol
$=\frac{4 \times 0.005}{(4+16) \times 10^{-3}}=1.0$
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