Concentration refers to the amount of solute dissolved in a specific amount of solvent. To compare concentrations, the amount of solute must be measured within the same volume of solvent. In the example given, Solution A contains 10g of salt dissolved in 50mL of water, while Solution B contains 3g of salt dissolved in 10mL of water. Calculating the concentration per 100mL, Solution B contains 30g of salt per 100mL and is therefore more concentrated than Solution A which contains 20g of salt per 100mL. A saturated solution contains the maximum amount of solute that can dissolve at a given temperature, while an unsaturated solution can still dissolve more solute.

1. Concentration

2. Concentration
Remember a solution is made when one substance
dissolves into another
Solute: the substance that dissolves
Solvent: the substances that does the dissolving
example: crystal light (solute) dissolving in water (solvent).
Concentration: is the amount of solute dissolved in a specific
amount of solvent
example: 50g of solute dissolved in 100mL of water. This is
read as 50g per 100mL of solution.

3. Concentration
When comparing the concentrations of solutions, you need
to know the same amount of solute within the same
volume of solvent!
Get out your calculators!

4. Concentration
Example: Compare which solution is more concentrated;
A: 10g salt/50mL of water or
B: 3g salt/10mL of water.
Concentration = Amount of solute(g)
of Solution Amount of Solvent (ml)
Step 1: Find concentration for 1 ml
Step 2: Compare concentrations per 100ml

5. Concentration
Example: Compare which solution is more concentrated;
A: 10g salt/50mL of water or
B: 3g salt/10mL of water.
Concentration = Amount of solute(g)
of Solution Amount of Solvent (ml)
Solution A
Step 1: Find concentration for 1 ml
𝟏𝟎𝒈 𝒔𝒂𝒍𝒕
𝟓𝟎 𝒎𝒍 𝒐𝒇 𝒘𝒂𝒕𝒆𝒓
𝒕𝒉𝒊𝒔 𝒎𝒆𝒂𝒏𝒔 𝟏𝟎 ÷ 𝟓𝟎
=𝟎.𝟐𝒈/𝒎𝒍
Step 2: Compare concentrations per 100ml
𝟎. 𝟐𝒈𝒎𝒍 × 𝟏𝟎𝟎
=
𝟐𝟎𝒈
𝟏𝟎𝟎 𝒎𝒍

6. Concentration
Example: Compare which solution is more concentrated;
A: 10g salt/50mL of water or
B: 3g salt/10mL of water.
Concentration = Amount of solute(g)
of Solution Amount of Solvent (ml)
Solution B
Step 1: Find concentration for 1 ml
𝟑𝒈 𝒔𝒂𝒍𝒕
𝟏𝟎 𝒎𝒍 𝒐𝒇 𝒘𝒂𝒕𝒆𝒓
𝒕𝒉𝒊𝒔 𝒎𝒆𝒂𝒏𝒔 𝟑 ÷ 𝟏𝟎
=𝟎.3𝒈/𝒎𝒍
Step 2: Compare concentrations per 100ml
𝟎. 𝟑𝒈𝒎𝒍 × 𝟏𝟎𝟎
=
𝟑𝟎𝒈
𝟏𝟎𝟎 𝒎𝒍

7. Concentration
Example: Compare which solution is more concentrated;
A: 10g salt/50mL of water or
B: 3g salt/10mL of water.
Comparison
Solution A:
𝟐𝟎𝒈
𝟏𝟎𝟎 𝒎𝒍
or Solution B:
𝟑𝟎𝒈
𝟏𝟎𝟎 𝒎𝒍
Solution B is more concentrated

8. Concentration
Unsaturated solution: is when more solute can dissolve
within the solution
Saturated solution: is when a solute can no longer dissolve
within the solution
Solubility: the maximum amount of solute you can dissolve
at that temperature.
Eg. Solubility of ice tea 20 g(in 100ml of water) at 22°C
Saturation Point: the stage at which no more solute can be
dissolved into the solvent