Question

Which of the following weak acids would you use to prepare a buffer solution at a pH of 9.2? Formic acid (HCOOH), $K_a = 1.8 imes 10^{-4}$ Phosphoric acid ($H_3PO_4$), $K_a = 7.5 imes 10^{-3}$ Ammonium ion ($NH_4^+$), $K_a = 5.6 imes 10^{-10}$ Carbonic acid ($H_2CO_3$), $K_a = 4.3 imes 10^{-7}$

          Which of the following weak acids would you use to prepare a buffer solution at a pH of 9.2?
Formic acid (HCOOH), $K_a = 1.8 	imes 10^{-4}$
Phosphoric acid ($H_3PO_4$), $K_a = 7.5 	imes 10^{-3}$
Ammonium ion ($NH_4^+$), $K_a = 5.6 	imes 10^{-10}$
Carbonic acid ($H_2CO_3$), $K_a = 4.3 	imes 10^{-7}$

Which of the following weak acids would you use to prepare a buffer solution at a pH of 9.2?
Formic acid (HCOOH), Ka = 1.8 imes 10^-4
Phosphoric acid (H3PO4), Ka = 7.5 imes 10^-3
Ammonium ion (NH4^+), Ka = 5.6 imes 10^-10
Carbonic acid (H2CO3), Ka = 4.3 imes 10^-7

Added by Vincent A.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert John Incabo

08/04/2023

Step 1

The pKa is the negative logarithm of the Ka value. Show more…

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Which of the following weak acids would you use to prepare a buffer solution at a pH of 9.2? Formic acid (HCOOH) Ka = 1.8 x 10^-4 Phosphoric acid (H3PO4) Ka = 7.5 x 10^-3 Ammonium ion (NH4+) Ka = 5.6 x 10^-10 Carbonic acid (H2CO3) Ka = 4.3 x 10^-7