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

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

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

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

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)

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)

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