Question

You have 100 mL of solution with a concentration of 1.50 mol/L. You pipette 10 mL of this solution to a 50 mL volumetric flask and top up the rest with water to the 50 mL mark. What is the concentration of the diluted solution in the 50 mL volumetric flask?

Answer 1

0.3 mol/L is the concentration of the diluted solution in the 50 mL volumetric flask.

Step-by-step explanation:

We have 100 mL of solution with a concentration of 1.50 mol/L.

Molarity of the solution before dilution =
`M_1=1.50 mol/L`

Volume 1.50 mol/L solution added in 50 mL volumetric flask =
`V_1=10 mL`

Molarity of the solution after dilution =
`M_2=?`

Volume of solution after dilution =
`V_2=50 mL`

`M_1V_1=M_2V_2` (dilution)

`M_2=(M_1V_1)/(V_2)=(1.50 mol/L* 10 mL)/(50 mL)`

`M_2=0.3 mol/L`

0.3 mol/L is the concentration of the diluted solution in the 50 mL volumetric flask.