# Question #a518c

##### 1 Answer

You could dilute a sample of pure methanol.

#### Explanation:

The easiest way to prepare an **80% v/v** solution of methanol is to dilute a sample of *pure methanol* with water.

To make the calculations easier, let's assume that you want to make a

A solution's percent concetration by volume is defined as the ratio between the volume of solute, in your case methanol, and the total volume of the solution, multiplied by 100.

If your target solution has a total volume of 1.0 L, then you can use this formula to determine how much methanol it must contain in order to have a percent concentration by volume of **80%**.

This means that if you take **800 mL** of pure methanol and add enough water to get the total volume of the solution to **1.0 L**, the resulting solution will have a percent concetration by volume of methanol of **80%**.