1. Concentration
How to make a standard solution of a known concentration. C
Calculate the concentration of a solution. B
Re-arrange equation to calculate mass/volume when given concentration and volume/mass. A

2. Starter
Use white boards to answer recap quiz.

3. Any analytical test must be carried out on a solution.
You only test a sample (small bit of it).
Dissolve the sample in a solution.
Aqueous means water
Non aqueous any thing but water. E.g. ethanol
Must follow a standard procedure.
Standard procedures are the safest, most effective and most accurate.
A standard procedure is the same in a company, nationally and internationally.
Standard procedures are always reliable
Standard proceedures for collection, storgae and testing.

4. Concentration = mass of solute ÷ volume of solvent (g/dm3) (g) (dm3) x

5. Complete activity sheet

6. Making a standard solution
(This has a known concentration)
Work out how many g of solute you need by using equation.
Weigh out mass of solute.
Add a small amount of distilled water and stir.
Tip in to a volumetric flask, use a funnel
Rinse the beaker, rod and funnel and add to flask.
Top up to correct volume, ensure meniscus reaches the line.
Stopper and mix a few times.
Check meniscus.

7. Make a standard solution
Make 250cm3 of 314g/dm3 of NaCl
To answer :
Why carry out steps 3-8?

8. Plenary Rate learning 1-4 (1 poor, 4 excellent)
Rate activities (as above)
Write 1 thing you really understand
Write 1 thing you still do not understand