Question

What volume of 12 M `HCl` solution is needed to prepare 5 liters of 0.0250 M solution?

Answer 1

`0.0104 L` of 12 M HCl is needed.

Explanation:

In order to get the answer, you have to use the dilution equation:

`M_1` is the initial concentration
`V_1` is the initial volume
`M_2` is the final concentration
`V_2` is the final volume

* TIP. * Whenever you are going from a highly concentrated substance to a less concentrated substance by increasing the volume of the solvent (dilution) you always use this equation.

We know `M_1`,`M_2` , and `V_2` . All we have to do rearrange the equation to solve for the `V_1`:

`(M_2xxV_2)/M_1`= `V_1`

`(0.0250 cancel"M" xx5L)/(12cancel"M")` = `0.0104L`