Question

What is general criteria of choosing a suitable indicator for a given titration?

• A. The indicator should have a broad $pH$ range
• B. $pH$ at the end point of titration should be close to neutral point of indicator
• C. The indicator should have neutral point at $pH =7$
• D. The indicator must show a sharp colour change near the equivalence point of titration point

Answer 1

Answer: (B), (D)

a. Wrong: Indicator should have a small transition range
b. Correct: $pH$ at equivalence point $= pH _{\text {Ind }}$
c. Wrong: $pH$ at equivalence point and at the end point may be different
d. Correct: Factual statement