16.c CHEM 210 (Donohoue) Test 2:10/30/2017 Due: Thursday 11/16/2017 (Last Day of

Question

16.c

CHEM 210 (Donohoue) Test 2:10/30/2017 Due: Thursday 11/16/2017 (Last Day of class) Part 4: Polyprotic acids (Answer all questions in this section 16. As you know carbonie acid, H CO,, is of concern in the lab because it is one of the species that forms when CO; is absorbed into water. a carbonic acid, H:COs has (give a number) acid dissociation equilibriums (1 pl) Write these equilibriums as acid dissociation reaction and give the equilibrium expression (4 pts) Write these equilibriums as base association reaction and give the equilibrium expression (4 pts) d. If we assume that we have pare water what would be the expected pll? (l pt) Assuming a system with that pH what would be the principle species for the carbonic acid? (1 pt) Now solve for the actual pi, the pOH, and the fraction of your prixciple species in the system at this pll based on the system you have defined above if the initial concentration of H COs is 4 x 10 M f. 5 pts) 9I Page

Explanation / Answer

the equilbirium as a base is when CO3-2 and HCO3- act as a base, i.e. accept H+

CO3-2 + H2O <--> HCO3- + OH-

Kb2 = [HCO3-][OH-]/[CO3-2]

then

HCO3- + H2O <--> H2CO3 + OH-

Kb1= [H2CO3][OH-]/[HCO3-]

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