Chemical and Ionic Equilibrium - Result Question 28-1

28. The best indicator for detection of end point in titration of a weak acid and a strong base is phenolphthalein

$(1985,1 M)$

(a) methyl orange ( pH 3 to 4 )

(b) methyl red (pH 4.4 to 6.2)

(c) bromothymol blue (pH 6 to 7.5)

(d) phenolphthalein ($8$ to $10.6$ )

Show Answer

Answer:

Correct Answer: 28. (a, c)

Solution:

  1. When a weak acid $(\mathrm{H} X)$ is titrated against a strong base $NaOH$ , basic salt $(\mathrm{Na} X)$ is present at the end point which makes end point slightly basic with pH around $8$ . Hence, phenolphthalein, that changes its colour in this pH range, would be the best choice of indicator to detect the end point.
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