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For each of the solutions titrated, why are the concentrations of OH-, CO32-, and HCO3- somewhat...

For each of the solutions titrated, why are the concentrations of OH-, CO32-, and HCO3- somewhat different from those which were indicated on the sample designations?

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Answer #1

The concentrations of OH-, CO32-, and HCO3- are somewhat different from those which were indicated on the sample designations because the sample designations show the values before reaching any equilibrium that is initial values of these species without cosideration of following reaction equilibriums in the aquous medium.

HCO3- +H2O -<---> H2CO3  + OH-

HCO3-  -<---> CO32- +H+

H2O -<--->H+ + OH-

The actual concentrations in the aquous medium are obtained only after considering the above equilibrium reaction equations as we do in the laboratory to find the concentration of various species at different pH values starting from zero mL of titrant NaOH (initial state of titration ).

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