General Information about concentration of solution

Units of Concentration:


A solution is a homogeneous mixture of one substance (the solute) dissolved in another substance (the solvent).
Concentration is a ratio of the amount of solute to the amount of solvent.
A common task in a biotechnology lab is preparing solutions. What exactly is a solution? A solution is a mixture of what is dissolved (the solute) and the dissolving medium (the solvent). For example, if you are making koolaid the colored sugar is the solute and the pitcher of water is the solvent. The concentration of a solution is the ratio of the amount of solute to solvent. It is necessary to prepare solutions with the correct concentration or you can destroy months of hard work in a biotechnology lab.

Percent volume
% volume = volume solute (ml) x 100
volume solution (ml)
Percent mass
% mass = mass solute (g) x 100
mass solution (g)

Solution = solvent + solute

Example 1:
What is the percent by volume concentration of a solution in which 75.0 ml of ethanol is diluted to a volume of 250.0 ml?

Example 2:
What volume of acetic acid is present in a bottle containing 350.0 ml of a solution which measures 5.00% concentration?