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aleksandrvk [35]
4 years ago
15

Which of the following is a proper buffer substituent pair?

Chemistry
1 answer:
vlada-n [284]4 years ago
6 0

Answer:

\boxed{\text{c. Neither a nor b is correct}}

Explanation:

A buffer pair consists of either

  • A weak acid and its salt or
  • A weak base and its salt

(a) Oxalic acid and sodium oxalate

\rm H$_2$C$_2$O$_4$ + Li$_2$C$_2$O$_4$ \longrightarrow \, $2LiHC$_2$O$_4$

Oxalic acid is an acid and lithium acid is a base. Together, they will neutralise each other and form the salt LiHC₂O₄.

A solution of LiHC₂O₄ is not a buffer.

The correct buffer pair is H₂C₂O₄ and LiHC₂O₄

(b) Carbonic acid and sodium carbonate

\rm H$_2$CO$_3$ + Na$_2$CO$_3$ $\longrightarrow \,$ 2NaHCO$_3$

The carbonic acid and the sodium carbonate will neutralise each other and form the salt NaHCO₃.

A solution of NaHCO₃ is not a buffer.

The correct buffer pair is H₂CO₃ and NaHCO₃

\boxed{\textbf{Neither a nor b is correct}}

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