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

Question

16.a

CHEM 210 (Donohoue Test 2:10/30/2017 Due: Thursday 11/16/2017 (Last Day of class) Part 4: Polyprotic acids (Answer gll 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 (g Write these equilibriums as acid dissociation reaction and give the equilibrium expressiorn ive a number) acid dissociation equilibriums( pt) (4 pts) Wti t Write these equilibriums as base association reaction and give the equilibrium expression (4 pts) (1 pt) d. If we assume that we have pure water what would be the expected pH? e Assuming a system with that pH what would be the principle species for the carbonic acid? (l pt) f) Now solve for the actual pH, the pOH, and the fraction of your principle species in the system at this pll based on the system you have defined above if the initial concentration of H CO, is (5 pts) 4 x 10 M 91Page

Explanation / Answer

Q16a

it has 2 disociatio equilibrims

which are:

H2CO3(aq) --> HCO3-(aq) + H+(aq)

and

HCO3-(aq) --> H+ + CO3-2

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