Which of the following will give a buffer with a pH near 4.76 when the acid and conjugate base are mixed in equimolar proportions?
Acid Ka
NH4+ (from ammonia) 5.69 × 10-10
HC2H3O2 (acetic acid) 1.75 × 10-5
HF (hydrofluoric acid) 6.8 × 10-4
CH3CH2NH3+ (from ethylamine) 2.12 × 10-11
a. acetic acid
b. hydrofluoric acid
c. ethylamine
d. none
e. ammonia
Answer: A
Chemistry
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