Refer to the figure below and Figure 20.25, which show the fraction of species in solution [alpha (α)] as a function of pH. The following questions are in regard to the equilibria involved in an aqueous solution of H₂CO₃ (dissolved CO₂) in fresh water at 25°C.
(a) At what pH does [H₂CO₃(aq)] = [HCO₃⁻]?
(b) At what pH does [HCO₃⁻] = [CO₃²⁻]?
(c) What is the predominant species in solution when the solution has a pH of 8?
(d) What species are in solution when the solution has a pH of 7?

Data given in Figure 20.25

Transcribed Image Text:

Alpha 1.00 0.80 0.60 0.40 0.20 0.00 Fraction of H₂CO3 Fraction of HCO3 Fraction of CO3²- 2- 3 5 7 9 11 13 PH