Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 13 Solutions and Their Behavior - Study Questions - Page 505d: 71


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Work Step by Step

a) Osmotic pressure: $\Pi=cRT\rightarrow (3.8/760)atm=c\times0.082\ L.atm/mol.K\times (273+25)K$ $c=2.046\times10^{-4}\ mol/L$ Molar mass: $10.0\ g/L\div 2.046\times10^{-4}\ mol/L=48872\ g/mol$ b) Assuming $1\ L \approx 1\ kg_{solvent}\rightarrow m=2.046\times10^{-4}\ mol/kg$ F.p. depression: $\Delta T_f=K_fm=-1.86^{\circ}C/m\times 2.046\times10^{-4}\ mol/kg= -0.00038\ ^{\circ}C$ Freezing point: $-0.00038\ ^{\circ}C$ Since the value is very small, you would either need very precise equipment to measure it or incur severe experimental error.
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