Question

Number of mili-equivalents of solute in $0.5$ litres of $0.2N$ solution is:
(A) $10$
(B) $1$
(C) $100$
(D) $1000$

Answer 1

In order to answer this question, you must be aware of the basics of mole concept and just revise the concept of Equivalent weight. Firstly, find the number of Equivalents of solute by using the formula of Normality and then find the number of milli equivalents of the solutes by using the correct formula. And follow the below steps for detailed step by step solution.

Complete step-by-step solution: Step 1: In this step we will enlist all the given quantities:
Volume of Solution $= {\text{ }}0.5{\text{ }}L$
Normality of the solution $= {\text{ }}0.2{\text{ }}N$
Step 2: In this step we will calculate the number of equivalents of solute:
Let the number of equivalents $= e$
Normality $= \dfrac{e}{{volume}}$
$\Rightarrow \,0.2\, = \,\dfrac{e}{{0.5}}$
$\Rightarrow \,e\, = \,0.1$
Step 3: In this step we will calculate the number of milli-equivalents of solute:
Since, Number of milli-equivalents of solute in 1 equivalents of solute = ${10^3}$
So, Number of milli-equivalents of solute = $0.1 \times {10^3}$ = $100$
Therefore, the Number of milli-equivalents of solute = $100$ is the required answer.

Hence, option C is the correct answer.

Note: An equivalent is the amount of a substance that reacts with an arbitrary amount of another substance in a given chemical reaction. It is an archaic unit of measurement that was used in chemistry and the biological sciences. The mass of an equivalent is called its equivalent weight. An equivalent is the amount of a substance that will react with a certain number of hydrogen ions. A milli equivalent is one-thousandth of an equivalent. A liter measures fluid volume. It is a little bigger than a quart.