Single Choice

Which of the following indicator is most suitable for titration of $$HB$$ with strong base

A$$\text {Phenolphthalein} (8.3 - 10)$$
Correct Answer
B$$\text {Bromothymol} (6-7.6)$$
C$$\text {Methyl red} (4.2-6.3)$$
D$$ \text {Malachite Green} (11.4 - 13)$$

Solution

Concept :-
Indicators are pH sensitive compounds which ionized at different pH values. Ionization alters the shape and charge of indicator molecules therefore their color changes at different pH values.
Phenolphthalein ionized at pH range $$8.3 $$ to $$10$$ and become pink in color but as the pH increases above $$10$$, its binds with titrating compound to form a complex and turns into purple above pH $$10$$.

$$HI_n + H_2 O \rightleftharpoons \underset{Pink}{In^-} + H_3O^+$$

Option A is the correct answer

SIMILAR QUESTIONS

Acids, Bases and Salts

In the titration of $$NaOH$$ and $$HCl$$, which of the following indicator will be used?

Acids, Bases and Salts

In the titration of strong acid and weak base, the indicator used is:

Acids, Bases and Salts

Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?

Acids, Bases and Salts

The best indicator for the detection of endpoint in the titration of a weak acid and a strong base is:

Acids, Bases and Salts

A solution containing $$Fe^{2+}$$ ions is titrated with $$KMnO_{4}$$ solution. Indicator used will be:

Acids, Bases and Salts

0.1 N solution of $${ Na }_{ 2 }{ CO }_{ 3 }$$ is titrated with 0.1 N HCl, best indicator is :

Acids, Bases and Salts

A solution containing $$Na_{2}CO_{3}$$ and $$NaOH$$ requires $$300\ mL$$ of $$0.1\ N\ HCl$$ using phenolphthalein as an indicator. Methyl orange is then added to the above-titrated solution when a further $$25\ mL$$ of $$0.2\ N\ HCl$$ is required. The amount of $$NaOH$$ present in the original solution is:

Acids, Bases and Salts

A solution containing $$Fe^{2+}$$ ions is titrated with $$KMnO_{4}$$ solution. Indicator used will be:

Acids, Bases and Salts

The indicator used in iodometric titrations is:.

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