During the titration of a particular acid, the P H changes from 7.0 to 9.0 with
ID: 877789 • Letter: D
Question
During the titration of a particular acid, the PH changes from 7.0 to 9.0 with the addition of 0.01mL of base. An indicator was used that had KI= 1.0x10-8. Calculate the ratio of basic to acidic forms of the indicators before and after the last 0.01mL of base was added. Use the result of your calculation to explain why this would or would not be a good indicator for this titration compared to phenolpthhalein.
I got that it is not a good indicator to Phanolpthalein. But please show the calculation to support the answer.
Explanation / Answer
9-7 =2
0.01*2 =0.02
if 1.0x10-8 ------9
x---------------7
x=7.77x10^-9
7.77x10^-9/0.02
=3.88x10^-7
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