exercise 1.2-concentration

1. 500 mL of oxalic acid solution is prepared by dissolving 10.0 g of
oxalic acid in water. The solution has a density of 1.05 gmL-1.
Calculate the molarity and molality of the oxalic acid solution.

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2. A solution contains glycerol, C3H8O3 and water. This solution is usually
used as coolant in vehicles such as cars. If the solution consists of 66.0 g
glycerol and 46.0 g water and its density is 1.10 g cm−3, calculate:

a) the per cent by mass of glycerol

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2. A solution contains glycerol, C3H8O3 and water. This solution is usually
used as coolant in vehicles such as cars. If the solution consists of 66.0 g
glycerol and 46.0 g water and its density is 1.10 g cm−3, calculate:

b) the concentration of glycerol

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3. The density of 10.5 molal NaOH solution is 1.33 g mL– 1 at 20C.

Calculate:
(a) the mole fraction of NaOH.

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3. The density of 10.5 molal NaOH solution is 1.33 g mL– 1 at 20C.

Calculate:
(b) the percentage by mass of NaOH

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3. The density of 10.5 molal NaOH solution is 1.33 g mL– 1 at 20C.

Calculate:
(c) the molarity of the solution

4. The density of 95% by mass of sulphuric acid, H2SO4 is
1.84 g mL-1. Calculate

(a) the molarity of H2SO4.

4. The density of 95% by mass of sulphuric acid, H2SO4 is
1.84 g mL-1. Calculate

b) the volume of the sulphuric acid needed to prepare 1.0 L
of 0.080 M solution. Explain.