Q:

Which statement about the phosphate buffer is correct

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Which statement about the phosphate buffer is correct?


  1. H2PO4 2− destroys acid and HPO4 − destroys base
  2. H2PO4 2− destroys base and HPO4 − destroys acid
  3. H2PO4 2− is basic and HPO4 − is acidic
  4. the ratio of H2PO4 2− : HPO4 − decreases following the addition of acid.

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B: Di-hydrogen phosphate is able to destroy base by donating one of

its hydrogen atoms (and in the process it becomes mono-hydrogen phosphate).

Choice D is wrong as addition of acid would decrease the proportion of monohydrogen

phosphate while increasing di-hydrogen phosphate. This would make

the ratio increase, that is the “fraction” would be larger.

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