A solution is a uniform mixture made up of two or more substances: solid, liquid, or gas. In a solution, a substance, known as a solute, is mixed with another substance, known as a solvent. Solids may be dissolved in liquid (salt in water). Gases may be dissolved in liquids (carbon in water). Liquids may be dissolved in other liquids (alcohol in water). Gases can be combined with other gases to create mixtures (helium and oxygen).Solutions begin two different ways. One is with pure ingredients and the other is with concentrated stocks, which are already mixed.This “how to” will show how to create a solution and show an example of making a two-liquid solution of ethanol and water.

Things You'll Need

Determine what is being made: 15% ethanol solution yielding a 1000 ml final volume.

Determine the units of measure being used for the solvent and the solute that it is being combined with it. Our liquid example is in milliliters and the solution is in milliliters.

Determine the final volume of the solution that is to be made: 1000 ml.

Determine the strength of the desired solution as a percentage. (15%)

Write the percentage as a fraction of volume. Usually 100 units of volume will be fine. (15 ml/100 ml)

Solve for the amount of solute to be used by using the formula M/V x Vf (mass or volume of solute/volume x final volume). (15 ml / 100 ml x 1000 ml = 150 ml)

Calculate the amount of solvent (water or whatever is required), which, when added to the solute, yields the final volume by subtracting the solute volume from the final volume. (1000 ml – 150 ml = 850 ml)

Mix the calculated volume of solute with the calculated volume of the solvent. Mix 150 ml of ethanol with 1000 ml of water.