Conjugate base will form a buffer

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Question- Which of the following acids, (listed with Ka values), and their conjugate base will form a buffer with a pH of 2.34?

HF, Ka = 3.5 x 10 -4

HClO, Ka = 2.9 x 10 -8

C6H5COOH, Ka = 6.5 x 10 -5

HCN, Ka = 4.9 x 10 -10

HClO2, Ka = 1.1 x 10 -2

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Reference no: EM13694377

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