Question

How many grams of MgCl2 is needed to make 10 ml of a 4% solution? (no units)

Answer 1

The mass of MgCl2 is 0.4 grams

Step-by-step explanation

Given that;

The volume of the solution is 10ml

The concentration of the solution is 4%

Follow the steps below to find the number of mass in grams of MgCl2

Since the volume of the solution is 10ml

The weight/volume of the solution is 4%

`\text{ \% concentration = }\frac{weight\text{ }}{\text{ volume}}`

Where the volume is 10ml

`\begin{gathered} \text{ }\frac{4}{\text{ 100}}\text{ = }\frac{\text{ weight}}{\text{ 10}} \\ \text{ 0.04 = }\frac{\text{ weight }}{10} \\ \text{ cross multiply} \\ \text{ weight = 0.04 }*\text{ 10} \\ \text{ weight = 0.4 grams} \end{gathered}`

Therefore, the mass of MgCl2 is 0.4 grams