Your mother gives you a bottle of orange juice concentrate to mix with water and serve it to your visiting friends. She asks you to mix two tablespoons of the concentrate with water in a glass tumbler. If each tablespoon measures 15 mL and you make 150 mL of juice per person, what is the % v/v of orange juice concentrate in the mixture you prepared? [Pg. No. 76]

Given:

Volume of one tablespoon = 15 mL

Volume of two tablespoons = 2 × 15 = 30 mL

Total volume of prepared juice = 150 mL

$$\% \text{ v/v} = \frac{\text{Volume of solute}}{\text{Volume of solution}} \times 100 = \frac{30}{150} \times 100 = 20\%$$

Therefore, the orange juice concentrate in the prepared mixture is 20% v/v.