A buffer solution contains 1.0 M Na₂CO₃(aq) and 1.0 M NaHCO₃(aq)

CHEMISTRY · Single correct · A Level · Chemistry · Acids and bases · Acids and bases

Problem

A buffer solution contains 1.0 M Na₂CO₃(aq) and 1.0 M NaHCO₃(aq). A few milliliters of 0.10 M HCl(aq) are added. Which of the following is the correct net ionic equation for the reaction that takes place? (a) 2H+(aq)+CO32−(aq)→H2CO3(aq)\mathrm{2H^+(aq)+CO_3^{2-}(aq)\rightarrow H_2CO_3(aq)} (b) H+(aq)+CO32−(aq)→HCO3−(aq)\mathrm{H^+(aq)+CO_3^{2-}(aq)\rightarrow HCO_3^-(aq)} (c) H+(aq)+HCO3−(aq)→H2CO3(aq)\mathrm{H^+(aq)+HCO_3^-(aq)\rightarrow H_2CO_3(aq)} (d) H+(aq)+HCO3−(aq)→CO2(g)+H2O(l)\mathrm{H^+(aq)+HCO_3^-(aq)\rightarrow CO_2(g)+H_2O(l)}

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