Concentrations and volumes of solutions

Last updated: 06/02/2020

AQA A-Level Chemistry Amount of substance Concentrations and volumes of solutions

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Question 1 of 18

1. Question
What is the definition of a standard solution?
- A solution with an unknown concentration
- The concentration of a solution
- A solution with a known concentration
- The volume of a solution
Question 2 of 18

2. Question
What is the definition of a concentrated solution?
- A large amount of solute per dm $^3$
- A small amount of solute per dm $^3$
- A solution with a low concentration
- A solution with a high concentration
Question 3 of 18

3. Question
What is the definition of a diluted solution?
- A small amount of solute per dm $^3$
- A large amount of solute per dm $^3$
- A solution with a low concentration
- A solution with a high concentration
Question 4 of 18

4. Question
What is the definition of the concentration of a solution?
- The amount of solute, in mol, dissolved per 1 dm $^3$
- The amount of solute, in mol, dissolved per 2 dm $^3$
- The amount of solute, in grams, dissolved per 2 dm $^3$
- The amount of solute, in grams, dissolved per 1 dm $^3$
Question 5 of 18

5. Question
What is the equation, including concentration, that is used to find the number of moles?
- Number of moles = concentration x volume
- Number of moles = volume ÷ concentration
- Number of moles = concentration ÷ volume
- Number of moles = concentration x mass
Question 6 of 18

6. Question
What does the term ‘molar’ mean?
- A solution with a concentration in mol dm $^{-3}$
- A solution with a concentration in grams per dm $^{-3}$
- The molar mass of a solution
- The number of moles per solution
Question 7 of 18

7. Question
Calculate the number of moles of solute dissolved in 3500 cm $^3$ of a solution with a concentration of 0.25 mol dm $^{-3}$ . Leave your answer to two significant figures.
- 0.88 mol
- 880 mol
- 14000 mol
- 0.071 mol
Question 8 of 18

8. Question
Calculate the concentration in, mol dm $^{-3}$ , of 1.25 mol of solute dissolved in 450 cm $^3$ . Leave your answer to one decimal place.
- 2.8 mol dm $^{-3}$
- 562.5 mol dm $^{-3}$
- 2.34 mol dm $^{-3}$
- 0.6 mol dm $^{-3}$
Question 9 of 18

9. Question
Calculate the concentration in, mol dm $^{-3}$ , of 0.88 mol of solute dissolved in 6 dm $^3$ . Leave your answer to one decimal place.
- 0.1 mol dm $^{-3}$
- 3.6 mol dm $^{-3}$
- 1.4 mol dm $^{-3}$
- 5.2 mol dm $^{-3}$
Question 10 of 18

10. Question
Calculate the number of moles of solute dissolved in 5.5 dm $^3$ of a solution with a concentration of 0.5 mol dm $^{-3}$ . Leave your answer to two significant figures.
- 2.8 mol
- 2.7 mol
- 0.0027 mol
- 11 mol
Question 11 of 18

11. Question
Calculate the concentration in, mol dm $^{-3}$ , of 1.955 mol of solute dissolved in 550 cm $^3$ . Leave your answer to two decimal places.
- 3.55 mol dm $^{-3}$
- 0.0036 mol dm $^{-3}$
- 3.56 mol dm $^{-3}$
- 5.56 mol dm $^{-3}$
Question 12 of 18

12. Question
Calculate the number of moles of solute dissolved in 12 dm $^3$ of a solution with a concentration of 0.725 mol dm $^{-3}$ . Leave your answer to one significant figure.
- 9 mol
- 7 mol
- 8 mol
- 10 mol
Question 13 of 18

13. Question
Calculate the mass of H $_2$ O needed to prepare 7.5 dm $^3$ of a solution with a concentration 0.25 mol dm $^{-3}$ . Leave your answer to two decimal places.
- 33.75 grams
- 30.00 grams
- 0.03 grams
- 0.63 grams
Question 14 of 18

14. Question
Calculate the mass of Cl $_2$ needed to prepare 3.5 dm $^3$ of a solution with a concentration of 0.0125 mol dm $^{-3}$ . Leave your answer to one decimal place.
- 3.1 grams
- 0.3 grams
- 3.2 grams
- 0.2 grams
Question 15 of 18

15. Question
Calculate the number of moles of solute dissolved in 25 cm $^3$ of a solution with a concentration of 1.5 mol dm $^{-3}$ . Leave your answer to two significant figures.
- 0.038 mol
- 0.06 mol
- 16.67 mol
- 36 mol
Question 16 of 18

16. Question
Calculate the mass of NaCl needed to prepare 68 cm $^3$ of a solution with a concentration 0.2 mol dm $^{-3}$ . Leave your answer to two significant figures.
- 0.80 grams
- 80 grams
- 0.90 grams
- 5.70 grams
Question 17 of 18

17. Question
Calculate the number of moles of solute dissolved in 150 cm $^3$ of a solution with a concentration of 3.05 mol dm $^{-3}$ . Leave your answer to two significant figures.
- 0.46 mol
- 49.18 mol
- 20.33 mol
- 0.02 mol
Question 18 of 18

18. Question
Calculate the concentration in, mol dm $^{-3}$ , of 0.125 mol of solute dissolved in 5 dm $^3$ . Leave your answer to two decimal places.
- 0.03 mol dm $^{-3}$
- 0.63 mol dm $^{-3}$
- 0.0063 mol dm $^{-3}$
- 0.27 mol dm $^{-3}$