Chemists often use molarity M, in moles/liter, to measure the concentration of solutions. Molarity is a common unit of concentration because the volume of a liquid is very easy to measure. However, the drawback of using molarity is that volume is a temperature-dependent quantity. As temperature changes, density changes, which affects volume. Volume markings for most laboratory glassware are calibrated for room temperature, about 20∘C. Fortunately, there are several other ways of expressing concentration that do not involve volume and are therefore temperature independent.
A 2.400×10−2 M solution of glycerol (C3H8O3) in water is at 20.0∘C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.0 mLmL . The density of water at 20.0∘C is 0.9982 g/mL.
A. Calculate the molality of the glycerol solution.
B. Calculate the mole fraction of glycerol in this solution.
C. Calculate the concentration of the glycerol solution in percent by mass.
D. Calculate the concentration of the glycerol solution in parts per million.
Answers: 1
Chemistry, 22.06.2019 00:40
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Chemists often use molarity M, in moles/liter, to measure the concentration of solutions. Molarity i...
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