WHY is it e???? Helppp???!!! :( In the titration of a solution of the extremely
ID: 720763 • Letter: W
Question
WHY is it e???? Helppp???!!! :(In the titration of a solution of the extremely weak acid, HCN (Ka = 6.2 x 10-10), by a solution of sodium hydroxide of equal concentration, which of the following statements is true?
a. The equivalence point will occur at an acidic pH, and a suitable indicator would be one like alizarin that changes color between pH of 6 and about 7
b. The equivalence point will occur at a neutral pH, and a suitable indicator would be one like bromthymol blue that changes color between pH of 6 and about 7.5
c. The equivalence point will occur at a basic pH, and a suitable indicator would be one like bromthymol blue that changes color between pH of 6 and about 7.5
d. The equivalence point will occur at a basic pH, and a suitable indicator would be one like phenol red that changes color between pH of 7 and about 8
e. The equivalence point will occur at a basic pH, and a suitable indicator would be one like phenolphthalein that changes color between pH of 8 and about 11.
Explanation / Answer
For a titration between a weak acid and a strong base, even the minutest amount of extra base would change the pH drastically to the basic side from 7. So, e is the correct answer.
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