Which of the Following Weak Acids Would Make the Best

question 17

Multiple Choice

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

• A)acetic acid (K_a = 1.74 × 10-5,pK_a = 4.76)
• B)bicarbonate (K_a = 6.3 × 10-11,pK_a = 10.24)
• C)tris-hydroxymethyl aminomethane (K_a = 8.32 × 10-9,pK_a = 8.07)
• D)lactic acid (K_a = 1.38 × 10-4,pK_a = 3.86)

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