For the coagulation of 100mL of arsenious sulphide solution, 5mL of 1MNaCl is required. What is the coagulating power of NaCl?
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Solution
Total volume after addition of 5mL of 1MNaCl solution =105mL Thus, 105× molarity of NaCl in colloidal solution = 5×1 Molarity of NaCl in colloidal solution =5105 Concentration in millimole =5105×100=47.6