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Para-Aminobenzoic Acid (PABA),p-H2NC6H4(COOH),is Used in Some Sunscreens and Hair Conditioning

Question 128

Multiple Choice

Para-Aminobenzoic acid (PABA) ,p-H2NC6H4(COOH) ,is used in some sunscreens and hair conditioning products.Calculate the pH of an aqueous solution with [PABA] = 0.030 M and Ka = 2.2 × 10-5.


A) 1.52
B) 3.09
C) 4.66
D) 6.18

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