Question

If you want to create a 4% solution from a 10% 0.1L stock solution, how many ml of water would you add to the stock solution?O 40 mlO 0.25 mlO 250 mlO 150 mlO 4000 ml

Answer 1

Answer:

$250\text{ mL}$

Explanation:

Here, we want to know the volume of water to be added

Mathematically:

$C_1V_1\text{ = C}_2V_2$

Where:

C1 is the percentage concentration initially which is 10%

V1 is the initial volume which is 0.1 L (this is the same as 100 mL since 1000 mL = 1L)

C2 is the percentage concentration of the final solution which is 4%

V2 is the added volume that we want to calculate

Substituting the values, we have it that:

$\begin{gathered} 10\text{ }\times\text{ 100 mL = 4}\times V_2 \\ V_2\text{ = }\frac{10\times100}{4}\text{ = 250 mL} \end{gathered}$