Question

How much water is to be added to 50 mL 4N HCl to make it a normalsolution?[Ans. 150 mL)​

Answer 1

▶ Solution :

Given :

▪ Initial normality of solution = 4N

▪ Final normality of solution = 1N

▪ Initial volume of solution = 50ml

To Find :

▪ Amount of added water.

Formula :

✏ Here, mass of solute is constant throughout the process so we can say that...

$\boxed{\bf{\pink{N_1V_1=N_2V_2}}}$

• N1 denotes initial normality
• V1 denotes initial volume
• N2 denotes final normality
• V2 denotes final volume

Calculation :

$\implies\bf\:N_1V_1=N_2V_2\\ \\ \implies\sf\:4\times 50=1\times V_2\\ \\ \implies\sf\:V_2=200\:ml\\ \\ \implies\sf\:Amount\:of\:added\:water=200-50\\ \\ \implies\boxed{\bf{\purple{V_{water}=150\:ml}}}$

Answer 2

The above answer is correct !!