Single Choice

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:

A$$0.5\ g$$
B$$1\ g$$
Correct Answer
C$$2\ g$$
D$$4\ g$$

Solution

$$300\ mL\ HCl$$ of $$0.1\ N$$ neutralises entire amount of $$NaOH$$ and $$1/2$$ of $$Na_{2}CO_{3}$$. Remaining $$1/2$$ of $$Na_{2}CO_{3}$$ is neutralised by $$25\ mL$$ of $$0.2\ N\ HCl$$, i.e., $$50\ mL$$ of $$0.1\ N\ HCl$$.

Thus, $$250\ mL$$ of $$0.1\ N\ HCl$$ is required to neutralise $$NaOH$$ completely.

$$N_{1}V_{1}(NaOH) = N_{2}V_{2}(HCl)$$

$$= 0.1\times 250$$

$$= 25$$

$$W_{NaOH} = \dfrac {ENV}{1000} = \dfrac {40\times 25}{1000} = 1\ g$$.

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

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 $$Fe^{2+}$$ 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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