AQA Required Practical - The electrolysis of sodium chloride solution (brine).

AQA Required Practical for GCSE combined science or chemistry. Investigate what happens when aqueous solutions are electrolysed using inert electrodes.
Edexcel Core Practical
Practicals are 15% of your exam grade, this could be the difference between a grade 4 and a grade 5 or the difference between grade 7 and grade 9. There isn’t a large amount of content but there are a lot of skills that can be tested, to help you with this I’ve made videos of all the practical and written a workbook full or exam style questions.

I want to help you achieve the grades you (and I) know you are capable of; these grades are the stepping stone to your future. Even if you don't want to study science or maths further, the grades you get now will open doors in the future.



Some of the links in here are affiliate links, where is get a small percentage of any money spent, if you like my channel and want to support my work, clicking these is an easy way to do it.

Disclaimer; You should not carry out any of these practical’s without carrying out a full risk assessment of your own first.

I am human, and I make mistakes, please point out any that you find and there is no need to follow that with a load of abuse.

PhET Interactive Simulations
University of Colorado Boulder

Music; Something Elated by Broke For Free. From the Free Music Archive, CC BY

Images from; Classroom Core (TpT), Hidesy Clipart (TpT), The Cher Room (TpT), The Triple Point (TpT), Ninja Woman (TpT), The Painted Crew (TpT) Teacher's Clipart (TpT) Shutterstock

[sarahhyde]

wow i’ve been struggling with this practical for the whole gcse course and with this video a week before the exam something clicked and i finally get it!! i can’t thank you enough!

[cecillouise]

This was helpful, thank you! In class today I happened to ask my science teacher to go over this specific page in the revision guide (as we are going over C2) but he didn't get to it, so this was perfect timing!

[charlottespencer]

Thank you so much, I've been so confused by half equations

[luciehulin]

Urgent question! Why is hydrogen attracted to the cathode instead of sodium? Is it something to do with their reactivity?

[alaasleem]

Please... Can you help me about calcaltions of hydrogen production analyses..how can i draw the equevelant electric circuit.. What is the relation between number of plates and the voltage

[maxwoski]

Why are there more Hydrogen gas bubbles released than chlorine ?
Is it because there's just a larger volume of water and so more hydrogen particles forming? Whilst there's less chlorine, i. e solution is quite dilute. Or is it something to do with Hydrogen's density or lower solubility in water?

Or even molar ratio, with H2O meaning molar ratio of 2:1 between hydrogen and chlorine in the solution, but we're taught that it dissociates into OH- and H+ meaning the molar ratio wouldnt occur?

[Sean-rsbk]

My question is how do you know that the hydrogen will form at the cathode? Is it always going to be the fact that as long as the metal is more reactive then hydrogen, hydrogen is produced at the cathode? Else, less reactive then hydrogen, the metal will form at the cathode?

[harrysvensson]

What do you get if you change both electrodes to iron?

[manvirsingh]

could you do a video on geology a level like weather you are talking