Chemistry: The Molecular Science (5th Edition)

Published by Cengage Learning

Chapter 15 - Additional Aqueous Equilibria - Questions for Review and Thought - Topical Questions - Page 693: 14a

Answer

$H_3PO_4$ and $NaH_2PO_4$ are not the best combination.

Work Step by Step

1. Identify the acid: $H_3PO_4$. 2. Calculate its pKa: $pKa = -log(Ka)$ $pKa = -log( 7.2 \times 10^{- 3})$ $pKa = 2.14$ 3. Compare this number to 7. - It is not approximately 7, therefore, these compounds are not the best combination for a buffer with neutral pH.

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