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Assuming complete dissociation of the salts , calculatethe molatity of sodium chloridesolution whose elevation in boilingpoint is numerically equal to the depression in frezing point of0.02 m aluminium sulphatesolutionin water (K_(b) and k_(f) for water are 0.52and 1.86 K kg " mol"^(-1)respectively ). |
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Answer» Solution :I for NACL = 2,in for`Al_(2) (SO_(4))_(3) = 5` ` Delta T_(B)` [ NaCl sol.] = `Delta T_(f) [ Al_(2) (SO_(4))_(3) " sol ." ]` (GIVEN ) ` :. i xx K_(b) xx m (NaCl) = i xx K_(f) xx m [ Al_(2) (SO_(4))_(3)] . i.e ., 2 xx 0.52 xx m = 5 xx1.86 xx 0.2 or m = 1.788` |
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