The depression in freezing point observed for a formic acid solution of concentration 0 . 5 mL L - 1 is 0 . 0405 ° C . Density of formic acid is 1 . 05 g mL - 1 . The Van't Hoff factor of the for

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The depression in freezing point observed for a formic acid solution of concentration 0 . 5 mL L - 1 is 0 . 0405 ° C . Density of formic acid is 1 . 05 g mL - 1 . The Van't Hoff factor of the formic acid solution is nearly: (Given for water k f = 1 . 86 K kg mol - 1 )

TestHub · Accepted Answer

HCOOH = 0 . 5 ml L - 1 ⇒ 0 . 5 ml × 1 . 05 g ml - 1 HCOOH in 1 L ⇒ 0 . 525 g HCOOH in 1 L Weight of water will be = 1 kg since density of water is 1 kg / L m = 0 . 525 46 1 kg mol [Assuming dilute solution] ∴ ΔT f = iK f m ⇒ i = ΔT f k f m = 0 . 0405 × 46 1 . 86 × 0 . 525 = 1 . 9

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