A sample of carbonic acid,

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

50.0\,\text{mL}

sample of

0.100\,\text{M}

carbonic acid,

H_2CO_3(aq)

, is titrated at constant temperature with

0.150\,\text{M}

aqueous sodium hydroxide. Carbonic acid is diprotic. (a) Write separate balanced net ionic equations for the first and second proton‐transfer steps that occur during the titration. (b) Calculate the volume of

NaOH

solution required to reach the first equivalence point. (c) Immediately after the first equivalence point but before the second, which ionic species derived from

H_2CO_3

is present in greatest concentration? Explain using stoichiometric reasoning. (d) Calculate the total volume of

NaOH

solution required to reach the second (final) equivalence point.

Related theory

Equilibrium
Acid-Base Titrations

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