SSCE HSC Chemistry Alcohols: A solution containing potassium

Question

A solution containing potassium dihydrogen phosphate and potassium hydrogen phosphate is a common laboratory buffer with a pH close to 7.

Which row of the table correctly identifies the chemistry of this buffer?

| Buffer equation                      | Acid is added to the solution | Alkali is added to the solution |
|--------------------------------------|-------------------------------|---------------------------------|
| A. HPO4^{2-} + H2O ⇌ PO4^{3-} + H3O^{+} | Right                         | Left                            |
| B. HPO4^{2-} + H2O ⇌ H3O^{+} + HPO4^{-}   | Left                          | Right                           |
| C. H2PO4^{-} + H2O ⇌ HPO4^{2-} + H3O^{+} | Left                          | Right                           |
| D. H2O + H2PO4^{-} ⇌ HPO4^{2-} + H3O^{+} | Left                          | Left                            |

A solution containing potassium dihydrogen phosphate and potassium hydrogen phosphate is a common laboratory buffer with a pH close to 7 - HSC - SSCE Chemistry - Question 17 - 2018 - Paper 1

Worked Solution & Example Answer:A solution containing potassium dihydrogen phosphate and potassium hydrogen phosphate is a common laboratory buffer with a pH close to 7 - HSC - SSCE Chemistry - Question 17 - 2018 - Paper 1

Buffer equation A

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