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3.4 Using concentrations of solutions in mol/dm3

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Question 51
H

A student made a solution of sodium carbonate, Na2CO3\text{Na}_2\text{CO}_3Na2​CO3​.

Relative formula mass (MrM_rMr​): Na2CO3=106\text{Na}_2\text{CO}_3 = 106Na2​CO3​=106

The figure shows the flask the student used, filled to the graduation mark.

Figure: The volumetric flask used by the student, filled to the graduation mark

A 250 cm³ volumetric flask with the bottom of the meniscus level with the graduation mark.

a.

The student dissolved 5.30 g of sodium carbonate in water and made the solution up to the graduation mark.

Calculate the concentration of the solution in mol/dm3\text{mol/dm}^3mol/dm3.

[3]
b.

The student made a second solution by dissolving 5.30 g of sodium carbonate in water and making the solution up to 500 cm3.

Give the concentration of the second solution in mol/dm3\text{mol/dm}^3mol/dm3.

[1]
Markscheme

3.4 Using concentrations of solutions in mol/dm3 Questions

  1. GCSE
  2. /Chemistry
  3. /3.4 Using concentrations of solutions in mol/dm3

106 exam-style questions on AQA GCSE Chemistry 3.4 Using concentrations of solutions in mol/dm3, covering 3.4.1 Concentration in mol/dm3. Each one has a worked solution and a mark scheme showing where the marks go.

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