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Please explain... In the titration of a weak acid HA with 0.100 M NaOH, the stoichiometric point...

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Chemistry

Please explain...

In the titration of a weak acid HA with 0.100 M NaOH, thestoichiometric point is known to occur at a pH value ofapproximately 11. Which of the following indicators would be bestto use to mark the endpoint of this titration?

a. an indicator with Ka = 10–13

b. an indicator with Ka = 10–14

c. an indicator with Ka = 10–10

d. an indicator with Ka = 10–8

e. an indicator with Ka = 10–11

An indicator HIn has Ka = 1 × 10–8. At pH = 6.0, what is theratio HIn/In– ?

a. 1/100

b. 10/1

c. 1/1

d. 100/1

e. none of these

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