The Student Room Group

GCSE chemistry

For paper 1 higher seperate AQA chemistry what did you guys write for planning the experiment on how concentration affects voltage?
Reply 1
Original post by Jasmine6789
For paper 1 higher seperate AQA chemistry what did you guys write for planning the experiment on how concentration affects voltage?

I wrote about adding the 1mol/dm3 solution in different proportions to make different concentrations of solution with volume 50cm3. Eg to make 0.2 mol/dm3, you need 10cm3 of the solution with 40cm3 pure water, to make 0.4 mol/dm3 you need 20cm3 solution with 30cm3 pure water, etc. I've seen others put that they add water to the same beaker to change the concentration, but imo this would make it an invalid test since you're changing the volume of the solution which may affect the results. Then I put in the electrodes to each beaker (including a beaker of pure water as a control), and as overkill I put in that I washed the electrodes with pure water and then dried them after each use. Idk if you needed that, just wanted to secure the marks.

Quick Reply