Ch 15 Concentration of Solution MCQ

9. What volume of water has to be added to dilute 150 cm³ of 6.0 M sodium hydroxide solution to 1.0 M?

• A. 150 cm³

• B. 550 cm³

• C. 750 cm³

• D. 900 cm³

10. What is the volume of water that should be added to 250 cm³ of 0.20 M K₂CO₃ solution to dilute it to 0.05 M?

• A. 250 cm³

• B. 500 cm³

• C. 750 cm³

• D. 1000 cm³

4. What is the concentration of bromine in a 200 cm³ of bromine solution which contains 1.598 g of bromine?

(Relative atomic mass: Br = 79.9)

• A. 0.02 mol dm^-3

• B. 0.04 mol dm^-3

• C. 0.05 mol dm^-3

• D. 0.06 mol dm^-3

5. What is the molarity of the resultant MgCl₂ solution formed by mixing 100 cm³ of 0.5 M MgCl₂(aq) and 150 cm³ of 0.9 M MgCl₂(aq)?

• A. 0.70 M

• B. 0.74 M

• C. 1.23 M

• D. 1.58 M

6. A sample of a certain concentrated acid has a density of 1.96 g cm^-3 and contains 95.0% of the acid by mass. Given that the relative atomic mass of the acid is 100, what is the concentration of the acid in the sample?

• A. 17.4 M

• B. 18.2 M

• C. 18.6 M

• D. 19.3 M

7. 10 cm³ of ethanol (C₂H₅OH) (density = 0.789 g cm^-3) is added to 100 cm³ of water. If 25 cm³ of the solution is withdrawn from the solution, what is the molarity of this portion of solution?

• A. 1.56 M

• B. 1.72 M

• C. 6.88 M

• D. 17.2 M

8. 20.0 g of calcium bromide is dissolved in distilled water to prepare a 1.50 M calcium bromide solution. What is the volume of the solution formed?

(Relative atomic masses: Ca = 40.1, Br = 79.9)

• A. 33.3 cm³

• B. 66.7 cm³

• C. 80.0 cm³

• D. 111 cm³