Canadian Society for Medical Laboratory Science (CSMLS) Practice Exam

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How much NaCl is required to make 100 ml of a 2% solution?

The correct answer is: 2g

To prepare a 2% NaCl solution, the concentration indicates that there are 2 grams of NaCl per 100 milliliters of solution. This percentage is calculated using the formula: \[ \text{Mass of solute (g)} = \text{Percentage (%) } \times \text{Volume of solution (mL)} / 100 \] Substituting the values for a 2% solution in 100 mL gives: \[ \text{Mass of NaCl} = 2 \times 100 / 100 = 2g \] Therefore, to achieve the desired concentration of 2%, you need to dissolve 2 grams of NaCl in enough water to make the total volume equal to 100 mL. This is why the correct answer is 2 grams.