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What is its conjugate base and what is that bases dissociation constant?

April 26, 2017base Chemistry conjugate constant dissociation Mathematics

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What is its conjugate base and what is that bases dissociation constant?

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Conjugate base has one less H ion. So it is HPO4 and the base’s constant is the autoionization constant for water divided by the acid’s constant so 1*10^-14/6.2*10^-7 = 1.6*10^-8. The answer is D.