Most effective coagulant for a colloidal solution of arsenic sulphide in water is
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$Al^{3+} > Ba^{2+} > Na^+$
$As_2S_3$ ia a negative sol and therefore coagulating power decreases as $Al^{3+} > Ba^{2+} > Na^+$ .
$As_2S_3$ ia a negative sol and therefore coagulating power decreases as $Al^{3+} > Ba^{2+} > Na^+$ .
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Arsenic Standard Solution (10 ppm As): Dissolve 0.33 g of arsenic trioxide in 5 ml of 2M sodium hydroxide and dilute to 250.0 ml with water. Dilute 1 volume of this solution to 100 volumes with water.
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