The indicator(s) appropriate for determination of end point in the titration of a weak acid with a strong… · ABC26IN0548
Subject: Inorganic Chemistry · Chapter: Analytical Chemistry · Topic: Analytical Chemistry & Instrumental – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium
The indicator(s) appropriate for determination of end point in the titration of a weak acid with a strong base is/are
(a)Phenolphthalein
(b)thymol blue
(c)bromophenol blue
(d)methyl orange
Answer
SELF-PRACTICE — the source book printed no answer.
Nothing is invented here, so this question has no answer on record.
Explanation
Answer: (a) phenolphthalein and (b) thymol blue — A weak acid–strong base titration has its end point in the basic range (pH ≈ 8–10). Phenolphthalein (8.2–10) and thymol blue (second range 8.0–9.6) fit. Bromophenol blue and methyl orange change in the acid range.