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20 mL of 0.5 M NaCl is required to coagulate 200 mL of As2S3 solution in 2 hours.

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20 mL of 0.5 M NaCl is required to coagulate 200 mL of As2S3 solution in 2 hours. The coagulating value of NaCl is____

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Correct answer is 50

Coagulating value is required milimole of electrolyte needed to coagulate 1L sol in 2 hours. 

Coagulating value = \(\frac{20\times 0.5}{200}\times1000=50\)

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