Question

1. What volume of 0.5 M CaCl, solution is needed to prepare 250 ml of solution that has ar
concentration 0.1 M?
(A) 12.5 mi
(B) 25 ml
(C) 50 ml
(D) 200 ml​

Answer 1

Answer: The correct option is C) 50 mL.

Explanation:

A solution consists of solute and solvent. A solute is defined as the component that is present in a smaller proportion while the solvent is defined as the component that is present in a larger proportion.

To calculate the amount of solute needed, the formula used is:

$C_1V_1=C_2V_2$             ....(1)

where,

$C_1\text{ and }V_1$ are the concentration and volume of stock solution

$C_2\text{ and }V_2$ are the concentration and volume of diluted solution

Given values:

$C_1=0.5M\\C_2=0.1M\\V_2=250mL$

Plugging values in equation 1, we get:

$0.5\times V_1=0.1\times 250\\\\V_1=\frac{0.1\times 250}{0.5}\\\\V_1=50mL$

Hence, the correct option is C) 50 mL.