Question

A 45 mL sample of calcium chloride stock solution produces a 0.182 M diluted solution by adding 50. mL of water. What is the molarity of the stock solution?

Answer 1

A solution of Calcium Chloride was made, we are asked to find the concentration of the initial solution.

We will apply the following equation to find it:

`C_1V_1=C_2V_2`

Where,

C1 is the initial concentration we have to find

V1 is the initial volume, 45mL

C2 is the final concentration, 0.182M

V2 is the final volume, 50. mL

We clear C1 and replace the known data;

`C_1=(C_2V_2)/(V_1)`
`\begin{gathered} C_1=(0.182M*50.mL)/(45mL) \\ C_1=0.202M \end{gathered}`

The molarity of the stock solution is 0.202M

Answer: 0.202M