Chemistry Practice Problems Diprotic Acid Practice Problems Solution: Ascorbic acid, H2C6H6­O6, is a common diprotic aci...

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Solution: Ascorbic acid, H2C6H6­O6, is a common diprotic acid with a Ka1 = 8.0 x 10 -5 and Ka2 = 1.6 x 10 -12.a. What are the three forms of the diprotic acid?   b. What is the principal species at pH = 2.00?  c. What is the principal species at pH = 6.10?  d. What is the principal species at 13.80?  e. What is the second most prominent species at pH = 8.10?  f. At what pH is [H2C6H6­O6] = [HC6H6­O6 - ]?  g. At what pH is [HC6H6­O6 - ] = [C6H6­O62 - ]? 

Problem

Ascorbic acid, H2C6HO6, is a common diprotic acid with a Ka1 = 8.0 x 10 -5 and Ka2 = 1.6 x 10 -12.

a. What are the three forms of the diprotic acid?

 

 

 

b. What is the principal species at pH = 2.00?

 

 

c. What is the principal species at pH = 6.10?

 

 

d. What is the principal species at 13.80?

 

 

e. What is the second most prominent species at pH = 8.10?

 

 

f. At what pH is [H2C6HO6] = [HC6HO6 - ]?

 

 

g. At what pH is [HC6HO6 - ] = [C6HO62 - ]?

 

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