Consider an aqueous solution containing 1.0 g/L of a protein (molar mass = 6.2 × 104 g/mol) with a density of 1.0 g/cmCalculate the freezing-point depression of this solution.Freezing-point depressionCalculate the osmotic pressure at 25°C of this solution.Osmotic pressureConsidering your answers, which colligative property, freezing-point depression or osmotic pressure, would be better used to determine the molartorrmasses of large molecules?

Molar mass of compound, M = 62000 g /molMass of protein = 1 gVolume of solution = 1 L

Answered: Consider an aqueous solution containing…

Chemistry & Chemical Reactivity

9th Edition

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter13: Solutions And Their Behavior

Section: Chapter Questions

Problem 37PS

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An aqueous solution made up of 32.47 g of iron(III) chloride in 100.0 mL of solution has a density of 1.249 g/mL at 25C. Calculate its (a) molarity. (b) molality. (c) osmotic pressure at 25C (assume i=4). (d) freezing point.
Water at 25 C has a density of 0.997 g/cm3. Calculate the molality and molarity of pure water at this temperature.
Erythrocytes are red blood cells containing hemoglobin. In a saline solution they shrivel when the salt concentration is high and swell when the salt concentration is low. In a 25C aqueous solution of NaCl, whose freezing point is 0.406C, erythrocytes neither swell nor shrink. If we want to calculate the osmotic pressure of the solution inside the erythrocytes under these conditions, what do we need to assume? Why? Estimate how good (or poor) of an assumption this is. Make this assumption and calculate the osmotic pressure of the solution inside the erythrocytes.
Consider two solutions, A and B, separated by an osmotic semipermeable membrane that allows only water to pass through, as shown in the following diagram. Based on each of the following identities for solutions A and B, indicate whether the liquid level in compartment A, with time, will increase, decrease, or not change. a. A = 1.0 M NaCl solution and B = 2.0 M NaCl solution b. A = 5.0%(m/v) glucose solution and B = 4.0%(m/v) glucose solution c. A = 2.0 M KCl solution and B = 2.0 M KNO3 solution d. A = 1.0 M glucose solution and B = 1.0 M NaCl solution
A 12-oz (355-mL) Pepsi contains 38.9 mg caffeine (molar mass = 194.2 g/mol). Assume that the Pepsi, mainly water, has a density of 1.01 g/mL. For such a Pepsi, calculate: (a) its caffeine concentration in ppm; (b) its molarity of caffeine; and (c) the molality of caffeine.
Calculate the vapor pressure of water over each of the following solutions of glycerol, C3H8O3, at 28C (vaporpressureofpurewater=28.35mmHg). Glycerol can be assumed to be nonvolatile. (a) percentglycerolbymass=30.6 (b) 2.74 m (c) molefractionofglycerol=0.188

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