Concentration
Contents
Key Stage 2
Meaning
Concentration is how dilute or concentrated a solution is.
About Concentration
- When orange juice is added to water if there is a lot of water but not much orange juice then the solution is dilute. If there is a lot of orange juice, but very little water then it is concentrated.
Key Stage 3
Meaning
Concentration is the ratio of a solute to a solvent.
About Concentration
- The more solute in a solution the higher the concentration.
- The more solvent in a solution the lower the concentration.
- Concentration can have several units but the most common one used in science is Molarity (M).
Key Stage 4
Meaning
Concentration is the ratio of the mass of solute to the volume of solvent.
About Concentration
- Concentration can be measured in g/dm3 or mol/dm3 (Molarity).
- When calculating concentration in g/dm3 the mass of the solute is measured in grams and the volume of solvent is measured in decimetres cubed.
- When calculating concentration in mol/dm3 the amount of solute is measured in Moles by finding the mass and the relative formula mass of the chemical to find out the number of moles and the volume of solvent is measured in decimetres cubed.
Equation
Concentration by Mass
concentration (g/dm3) = \(\frac{mass (g)}{volume (dm^3)}\)
Where:
Concentration by Moles
concentration (g/dm3) = \(\frac{Moles (mol)}{volume (dm^3)}\)
Where:
- Moles = The number of moles of the solute. Found by dividing the mass in grams by the relative formula mass.
- volume = The volume of solvent.