General, Organic, and Biological Chemistry: Structures of Life (5th Edition)

Published by Pearson
ISBN 10: 0321967461
ISBN 13: 978-0-32196-746-6

Chapter 9 - Solutions - 9.5 Dilution of Solution - Questions and Problems - Page 351: 9.70

Answer

25 mL of that ibuprofen solution.

Work Step by Step

1. Write the dilution expression, and solve for the initial volume $(V_1)$ $C_1V_1 = C_2V_2$ $$V_1 = \frac{C_2V_2}{C_1} $$ 2. Substitute the values and calculate the initial volume: $$V_1 = \frac{(100. \space mL)(2.0 \space \% (m/v))}{8.0 \space \% (m/v)}$$ $$V_1 = 25 \space mL$$
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