1. Solutions
A solution is a homogeneous mixture (1 phase) where we can’t distinguish the substances that compose it even with the aid of observation instruments

2. Aqueous solution
An aqueous solution is a solution where the solvent is water

3. Concentration
The concentration of a solution corresponds to the quantity of solute over the quantity of solution

4. Dilution/Dissolution
Dilution : add solvent to the solution Dissolution: add solute to the solution Dilution = decrease in concentration Dissolution = increase in concentration

5. Ways of expressing concentration
In number of grams of solute per litre of solution (g/L)
In number of grams of solute per 100 ml of solution ( % m/v )
In number of millilitres of solute per 100 ml of solution ( % v/v)
In number of grams of solute per 100 g of solution ( % m/m)

6. Calculating Concentration
To calculate concentration in g/L we can use
this formula
C = m V
C (concentration g/L)
m ( mass in g)
V (volume in L)

7. Questions
1. What are 2 ways that we can change the concentration of a solution?
2. Which of the following is most concentrated?
24 g solute in 150 ml solution
21 g solute in 125 ml solution
32 g solute in 250 ml solution
__________ __________ _________
Most least