Single Choice

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

AMethyl orange
BMethyl red
CBoth $$A$$ and $$B$$
DNone of the above
Correct Answer

Solution

$$HCl$$ is a strong acid and $$NaOH$$ is a strong base. Therefore, titrating one against the other yields a complete reaction. The titration is complete when the $$pH$$ reaches $$7.0$$. Methyl orange would not be appropriate here, as the color change occurs at between $$3.1$$ and $$4.4$$ in an aqueous solution. Not helpful in this case. A much better choice here would be phenolphthalein, which goes from clear to pink at a $$pH$$ of $$8.2$$ still not exactly $$7.0$$, but well within the rapid transition point curve.

SIMILAR QUESTIONS

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

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

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:.

Contact Details