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Which of the Following Weak Acids Would Make the Best

Question 1

Multiple Choice

Which of the following weak acids would make the best buffer at pH = 5.0?


A) acetic acid (Ka = 1.74 × 10−5, pKa = 4.76)
B) H2PO4− (Ka = 1.38 × 10−7, pKa = 7.20)
C) bicarbonate (Ka = 6.3 × 10−11, pKa = 10.24)
D) tris-hydroxymethyl aminomethane (Ka = 8.32 × 10−9, pKa = 8.07)
E) lactic acid (Ka = 1.38 × 10−4, pKa = 3.86)

Correct Answer:

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