If a strong acid were to add H+ to the intracellular fluid, the effect would most likely be buffered, because
A. HPO42- would act as a weak acid and donate an H+ to become PO4-.
B. H2PO4- would act as a weak acid and accept an H+ to become H3PO4-.
C. HPO42- would act as a weak base and accept an H+ to become H2PO4-.
D. PO4 would act as a strong base and accept an H+ to become HPO4.
Answer: C
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