Chemistry, 23.03.2020 17:05, lindseycagle00

Consider a solution consisting of the following two buffer systems:

H2CO3 HCO3– + H+ pKa = 6.4

H2PO4– HPO42– + H+ pKa = 7.2
At pH 6.4, which one of the following is true of the relative amounts of acid and conjugate base present?
***Please explain why the right answer is right and why the other ones are wrong.

a. [H2CO3] > [HCO3- ] and [H2PO4- ] > [HPO42- ]

b. [HCO3- ] > [H2CO3] and [HPO42- ] > [H2PO4- ]

c. [H2CO3 ] > [HCO3- ] and [HPO42- ] > [H2PO4- ]

d. [H2CO3] = [HCO3-] and [HPO42-] > [H2PO4- ]

e. [H2CO3] = [HCO3-] and [H2PO4- ] > [HPO42-]

Answers: 3

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Consider a solution consisting of the following two buffer systems:

H2CO3 HCO3– + H+ pKa...