16.b CHEM 210 (Donohoue) Due: Thursday 11/16/2017 (Last Day of class) Part 4: Po

Question

16.b

CHEM 210 (Donohoue) Due: Thursday 11/16/2017 (Last Day of class) Part 4: Polyprotic acids (Answer all questions in this section) 16. As you know carbonic acid, H COs, is of concern in the lab because it is one of the species that forms when CO2 is absorbed into water. carbonic acid, H.CO has (give a number) acid dissociation equilibriums Write these equilibriums as acid dissociation reaction and give the equilibrium expression (1 pt) (4 pts) Write these equilibriums as base association reaction and give the equilibrium expression (4 pts) d. If we assume that we have pure water what would be the expected pH? (1 pt) ) Assuming a system with that pH what would be the principle species for the carbonic acid? (1 pt) f.) Now solve for the actual pH, the pOH, and the fraction of your principle species in the system at this phH based on the system you have defined above if the initial concentration of H COs is 4 103 M. 9I Pa ge

Explanation / Answer

B)

equilbrium expressions for H2CO3:

H2CO3 --> H+ + HCO3-

Ka1 = [H+][HCO3-]/[H2CO3]

for

HCO3-:

HCO3- --> H+ + CO3-2

Ka2 = [H+][CO3-2]/[HCO3-]

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