1. How much Dissolves? How much salt is there in the sea?

3. Mass of empty evaporating basin = Mass of evaporating basin + water = Mass of water used = THIS IS THE VOLUME USED Mass of evaporating basin + dried water = Mass of empty evaporating basin= Mass of solid remaining = THIS IS THE MASS OF SOLID DISSOLVED IN THE WATER

4. Example: 25cm 3 into dm 3 25/1000 = 0.025 dm 3 If 0.09g are dissolved in 0.025 dm 3, then using the equation below: 0.09g = 3.6g dm -3 0.025dm 3

5. Only this is different! Rearrange the equation so that you can find out V and n

6. Converting Concentrations To convert the concentration from mol dm -3 to g dm -3, simply multiply by the M r. g dm -3 = mol dm -3 x M r Eg. A solution of H 2 SO 4 has a concentration of 2 mol dm -3 Calculate the concentration in g dm -3 M r = (1 x 2) + 32 + (16 x 4) Answer: 2 mol dm -3 x 98 = 196 g dm -3

8. 1What mass of solute is dissolved in 2000 cm 3 of 48 g dm –3 solution? 2What mass of solute is dissolved in 750 cm 3 of 0.4 mol dm –3 of iron(II) nitrate (Fe(NO 3 ) 2 )? 3Convert 2 mol dm –3 of potassium hydroxide (KOH) into g dm –3. 4Convert 10.65 g dm –3 of sodium chlorate (NaClO 3 ) into mol dm –3. 5A solution of weedkiller contains 10 g of copper sulphate dissolved in 250 cm 3 of solution. What is its concentration in: ag dm –3 bmol dm –3 ?

9. Using the Burette Make sure the burette is closed to start with Add the solution using a funnel, take out the funnel before taking a reading Run some of the solution, so that no air bubbles remain. Put a piece of white paper behind the burette before taking a reading.