Quinine is a natural product extracted from the bark of the cinchona tree, which

Question

Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an anti malarial agent. When 1.7g of quinine is dissolved in 25g of cyclohexane, the freezing point of the solution is lowered by 4.36 degree C. Calculate the molar mass of quinine. Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an anti malarial agent. When 1.7g of quinine is dissolved in 25g of cyclohexane, the freezing point of the solution is lowered by 4.36 degree C. Calculate the molar mass of quinine.

Explanation / Answer

Delta Tf = i Kf m

i = 1 as quinine is a non electrolyte

Delta Tf = 4.36 degree C

Kf = 20.0 c/m

m= molality = moles / Kg of solution

Mass of solution = 25 g = 0.025 Kg

Now plugging in the values,

4.36 = 1 x 20.0 x m

m = 0.21

molality = 0.21 = moles / 0.025

Moles = 5.25 x 10^-3 mol

Molar mass = Mass / Moles = 1.7 g / (5.25 x 10^-3 mol) = 323.81 = 324 g/mol

Molar mass of quinine = 324 g/mol

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