Question

A student wants to prepare a solution of acetic acid and water having
30% v/v. If 6mL
of acetic acid has been taken then how much water must be added to get the desired concentration?​

Answer 1

Answer: 14 mL of water must be added to get desired concentration.

Explanation:

Here solute is acetic acid.

Given: Volume of acetic acid= 6mL

Concentration (v/v) of solution =30%

To find: The amount of water (in mL) needed to get the desired concentration of 30% v/v.

Solution:

Let the volume of water which is the solvent that is needed to get the desired concentration be x.

So, the volume of solution = 6+x

We know the formula,

Concentration of a solution (v/v%) =$\frac{Volume of solute}{Volume of solution}$× 100

⇒$\frac{6}{6+x}$ ×100=30

⇒600=180+30x

⇒30x=600-180

⇒x=$\frac{420}{30}$

⇒x=14 mL