AQA A level Chemistry Required Practical 2 - Measuring the enthalpy change when making a solution

Do you know how to calculate an experimental enthalpy change when a salt dissolves? Could you write a 6 mark method? Let me show you how?
(At some stage, I'll try to also do videos for RP2 looking at neutralisation reactions and flame / bomb calorimetry!)
This video is part of a series of exam question walk throughs, centred on the Required Practical Activities for AQA A-level Chemistry. (A lot of these are also PAGs for OCR, but the numbers are different e.g. Rates of Reaction is 7a and 7b for AQA but 9 and 10 for OCR). You can find all these videos in my Exam Walk Through playlist at bit.ly/DrdBWalkThroughs
If you found this helpful and want to support the channel, you can "buy me a coffee" buymeacoffee.com/drdebruin

[@mahira6448]

This is so helpful thank you!

[@louis4267]

Great video, in a recent mark scheme for 2017 Question 1.3, they used -q instead of q for the calculation, is this correct?

[@DrdeBruinsClassroom]

It depends on what you're actually trying to calculate. If it's an exothermic reaction, the temperature goes up, and your value of delta H should be negative, so you need to use -q. If you're talking about an endothermic process then you'd just use it as it is to get a positive value for delta H. Realistically, I just do the calculation and then pop a minus on after if it's exothermic!

[@user-vq4qy2hq5i]

@@DrdeBruinsClassroom Would adding the minus at the end, as opposed to the start of the q/mol calculation, lose you method marks in an exam (if the value of your final answer is wrong)?

[@edie9177]

@@user-vq4qy2hq5i i think you only get the mark for the correct sign if you get the final answer correct