Properties of Solutions: Colligative Properties
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Properties of Solutions
1. Anthraquinone contains only carbon, hydrogen and oxygen and has an empirical formula of C7H4O. The freezing point of camphor is lowered by 22.3oC when 1.32 g of antraquinone is dissolved in 11.4 g of camphor. Determine the molecular formula of anthraquinone. ( Kf for camphor is 40.0).
2. A solution is prepared by mixing 25 ml of C5H12 ( density = 0.63 g/ml) and 45 ml of C6H14 ( density = 0.66 g/ml). Assume that the volumes add on mixing, calculate for C5H12
a) mass %
b) mole fraction
c) molality
d) molaroty.
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The solution discusses the properties of solutions regarding the colligative properties.
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1. Anthraquinone contains only carbon, hydrogen and oxygen and has an empirical formula of C7H4O. The freezing point of camphor is lowered by 22.3oC when 1.32 g of antraquinone is dissolved in 11.4 g of camphor. Determine the molecular formula of anthraquinone. ( Kf for camphor is 40.0)
A solution of anthraquinone in camphor is non-ionic (both are non-electrolytes), i = 1,
for camphor Kf = 40.ºC-kg/mol
ΔT = i x Kf ...
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