Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent.When 2.77 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 7.12⁢ ∘C. Look up the freezing point and Kf constant for cyclohexane in the Colligative Constants table.Calculate the molar mass of quinine. Constants for freezing-point depression and boiling-point elevation calculations at 1 atm:Kf value* Normal freezing K , value Normal boiling(°C/ m )SolventFormula(°C/ m )point ( °C)point ( °C)waterH 201.860.000.512100.00benzeneC 6 H 65.125.492.5380.1суclohexane C6 Н 12C 2 H 6 020.86.592.9280.7ethanol1.99-117.31.2278.4carbonCCI 429.8-22.95.0376.8tetrachloridecamphorС 10 Н 160 37.8176

We can use the equation for depression in freezing point. That is, The depression in freezing point,…

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Quinine is a natural product extracted from the bark of the cinchona tree, which is native to South America. Quinine is used as an antimalarial agent.

When 2.77 g of quinine is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 7.12⁢ ∘C. Look up the freezing point and Kf constant for cyclohexane in the Colligative Constants table.

Calculate the molar mass of quinine.

Constants for freezing-point depression and boiling-point elevation calculations at 1 atm:
Kf value* Normal freezing K , value Normal boiling
(°C/ m )
Solvent
Formula
(°C/ m )
point ( °C)
point ( °C)
water
H 20
1.86
0.00
0.512
100.00
benzene
C 6 H 6
5.12
5.49
2.53
80.1
суclohexane C6 Н 12
C 2 H 6 0
20.8
6.59
2.92
80.7
ethanol
1.99
-117.3
1.22
78.4
carbon
CCI 4
29.8
-22.9
5.03
76.8
tetrachloride
camphor
С 10 Н 160 37.8
176

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