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Quantitative Analysis - Equilibrium

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1. In you book, the author states that K for carbonic acid is 4.5 à? 10 (see
below)

H2CO3(aq) ↔H+ (aq) + HCO3 (aq) K a1 = 4.5 à? 10-7

Is this a valid equilibrium constant for this reaction? Fully explain your
answer.

4. Glycine, the simplest of the amino acids found in proteins, is a diprotic acid
2 with the formula HO2CCH2 NH3+ .If we symbolize glycine as H2G+ , we can
write the following equations for its stepwise dissociation.

H2G+ (aq) ↔HG(aq) + H (aq) K a1 = 4.50 à? 10-3
HG(aq) ↔G-(aq) + H+(aq) K a2 = 2.50 à? 10-10

Calculate the concentration of H +(aq), G-(aq), HG(aq), and H 2G (aq) in a 2.00 M solution of glycine.

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The solution looks at Quantitative Analysis equilibrium. The dissociation of the compounds are determined.

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