A 0 . 5 percent solution of potassium chloride was found to freeze at - 0 . 24 ° C . The percentage dissociation of potassium chloride is (Nearest integer) (Molal depression constant for water is 1 . 80 K kg mol - 1 and molar mass of KCl is 74 . 6 g mol - 1 )

Question

A 0 . 5 percent solution of potassium chloride was found to freeze at - 0 . 24 ° C . The percentage dissociation of potassium chloride is (Nearest integer) (Molal depression constant for water is 1 . 80 K kg mol - 1 and molar mass of KCl is 74 . 6 g mol - 1 ),

MARKS App · Accepted Answer

KCl → K + + Cl - 1 - - 1 - α α α i = 1 - α + 2 α = 1 + α ∆ T f = i K f · m 0 . 24 = 1 + α 1 . 80 × 0 . 5 74 . 6 × 1000 99 . 5 α = 0 . 98 α % = 98 %

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