Chemistry 2e · 3.4 Other Units for Solution Concentrations

Other Units for Solution Concentrations: practice problems

6 problems from the book, with its answers. Check your working, or have any of them explained to you on the whiteboard.

1. Exercises 69

   Consider this question: What mass of a concentrated solution of nitric acid (68.0% HNO₃ by mass) is needed to prepare 400.0 g of a 10.0% solution of HNO₃ by mass?

   (a) Outline the steps necessary to answer the question.

   (b) Answer the question.

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2. Exercises 71

   What mass of solid NaOH (97.0% NaOH by mass) is required to prepare 1.00 L of a 10.0% solution of NaOH by mass? The density of the 10.0% solution is 1.109 g/mL.

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3. Exercises 73

   The hardness of water (hardness count) is usually expressed in parts per million (by mass) of CaCO₃, which is equivalent to milligrams of CaCO₃ per liter of water. What is the molar concentration of Ca²⁺ions in a water sample with a hardness count of 175 mg CaCO₃/L?

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4. Exercises 75

   In Canada and the United Kingdom, devices that measure blood glucose levels provide a reading in millimoles per liter. If a measurement of 5.3 mM is observed, what is the concentration of glucose (C₆H₁₂O₆) in mg/dL?

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5. Exercises 77

   Copper(I) iodide (CuI) is often added to table salt as a dietary source of iodine. How many moles of CuI are contained in 1.00 lb (454 g) of table salt containing 0.0100% CuI by mass?

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6. Exercises 79

   D5W is a solution used as an intravenous fluid. It is a 5.0% by mass solution of dextrose (C₆H₁₂O₆) in water. If the density of D5W is 1.029 g/mL, calculate the molarity of dextrose in the solution.

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