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Chapter 7 – Practice Problems (Quantitative Units of Concentration)

  1. Differentiate between molarity and molality.
  2. Differentiate between mass percentage and parts per thousand.
  3. What is the molarity of a solution made by dissolving 13.4 g of NaNO3 of in 345 mL of solution?
  4. What is the molarity of a solution made by dissolving 332 g of C6H1206 of in 4.66 L of solution?
  5. How many moles of MgCl2 are present in 0.0331 L of a 2.55M solution?
  6. How many moles of NH4Br are present in 88.9 mL of a 0.228M solution?
  7. What volume of 0.556M NaCl is needed to obtain 0.882 mol of NaCl?
  8. What volume of 3.99M H2SO4 is needed to obtain 4.61 mol of H2SO4?
  9. What volume of 0.333M Al(NO3)3 is needed to obtain 26.7g of Al(NO3)3?
  10. What volume of 1.772M BaCl2 is needed to obtain 123 g of BaCl2?
  11. What are the individual ion concentrations and the total ion concentration in 0.66M Mg(NO3)2?
  12. What are the individual ion concentrations and the total ion concentration in 1.04M Al2(SO4)3?
  13. If the C2H3O2– ion concentration in a solution is 0.554M, what is the concentration of Ca(C2H3O2)2?
  14. If the Cl– ion concentration in a solution is 2.61M, what is the concentration of FeCl3?

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