Question

What volume, in milliliters, of calcium chloride 15.0 M stock solution would you use to
make 500 mL of 0.300M of calcium chloride solution?
20
5
15
10

Answer 1

Answer: The volume of stock solution of calcium chloride required is 10 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 of calcium chloride

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

Given values:

$C_1=15.0M\\C_2=0.300M\\V_2=500mL$

Plugging values in equation 1:

$15.0\times V_2=0.300\times 500\\\\V_2=10mL$

Hence, the volume of stock solution of calcium chloride required is 10 mL.