Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)

Published by Prentice Hall
ISBN 10: 0321908449
ISBN 13: 978-0-32190-844-5

Chapter 9 - Section 9.2 - Electrolytes and Nonelectrolytes - Questions and Problems - Page 290: 9.19

Answer

The $Na^+$ concentration is equal to 55 mEq/L

Work Step by Step

In order to balance the charges, the sum of the concentrations (in equivalents per liter) of the negative ions must be equal to the same of the positive ions. $$C_{Cl^-} + C_{HPO{_4}^{-2}} = C_{Na^+}$$ $$40. \space mEq/L + 15 \space mEq/L = C_{Na^+}$$ $$55 \space mEq/L = C_{Na^+}$$
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