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17 July, 11:16

Which of the four solutions is the best buffer against addition of acid or base?

a. na2hpo4

b. na2hpo4 + nah2po4

c. nah2po4

d. h2o submit for grading save and finish later?

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Answers (1)
  1. 17 July, 11:45
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    b. Na2HPO4 + NaH2PO4.

    A buffer is a solution of a weak acid and its conjugate base. The weak acid is H2PO4^ (-) and its conjugate base is HPO4^ (2-).

    All the other options are incorrect because they consist of only a single component.
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