Chapter 19, Problem 4STP

Interpretation Introduction

Interpretation : The moles of sodium hydroxide is to be calculated.

Concept Introduction : Salt and water are created when bases and acids react.

A strong acid and strong base react completely to form a neutral solution. A neutralization reaction is a name for this kind of reaction.

Answer to Problem 4STP

Correct answer: Option (D)

The moles of sodium hydroxide is $4.8\text{mol}$ .

Explanation of Solution

Reason for correct option:

The aqueous solution of $2.4\text{mol}$ of sulphuric acid is given.

The reaction between sodium hydroxide and sulphuric acid is given as

  ${\text{H}}_2{\text{SO}}_{\text{4}}\left(aq\right)\text{+}2\text{NaOH}\left(aq\right)\to {\text{Na}}_2{\text{SO}}_4\left(aq\right)\text{+}2{\text{H}}_{\text{2}}\text{O}\left(l\right)$

The above reaction is the balanced reaction.

The mole ratio is $1:2$ for the reaction between ${\text{H}}_2{\text{SO}}_{\text{4}}$ and $\text{NaOH}$ .

The moles of sodium hydroxide are calculated as follows:

  $\begin{array}{c}\text{Moles of NaOH}\text{=}\frac{2\text{mol NaOH}}{1\cancel{{\text{mol H}}_2{\text{SO}}_4}}\times 2.4\cancel{\text{mol}{\text{H}}_2{\text{SO}}_4}\\ =4.8\text{mol}\text{NaOH}\end{array}$

So, option (D) is the correct answer.

Conclusion

Reasons for incorrect options:

Option (A), (B), (C): These options are irrelevant because the mole ratio of sulphuric acid and sodium hydroxide is $1:2$ . Only option D is correct.