For the temperature change, you can just measure the initial temperature of the acid and alkali and then measure the maximum temperature reach? So we don't need to record the initial temperature, then record temperature at regular intervals and then plot a graph of temperature against time, and then extrapolate to when the two liquids are added together to find the maximum temperature? I remember doing both the methods described in the video and the one I have described, but are they both correct for this experiment? Or is it one I have described used for another type of enthalpy change experiment? If so, when do we use the one I have described?
Hi sir. Are details of the enthalpy of neutralisation and enthalpy of combustion experiments required? I just did the neutralisation experiment at school and haven't learned the combustion one, thanks
if the volumes of HCl and NaOH were not the same would you find out the moles left after one of the reactants is completely used up and then take this value as being the same as the moles of H2O?
You truly are the chemistry teacher we need but not the one we deserve
For the temperature change, you can just measure the initial temperature of the acid and alkali and then measure the maximum temperature reach? So we don't need to record the initial temperature, then record temperature at regular intervals and then plot a graph of temperature against time, and then extrapolate to when the two liquids are added together to find the maximum temperature? I remember doing both the methods described in the video and the one I have described, but are they both correct for this experiment? Or is it one I have described used for another type of enthalpy change experiment? If so, when do we use the one I have described?
Nice one g top guy
Hi sir. Are details of the enthalpy of neutralisation and enthalpy of combustion experiments required? I just did the neutralisation experiment at school and haven't learned the combustion one, thanks
thank you for the great videos sir. I wanted to ask you will you go over the AS/A2 papers from the old spec like f325 etc. thanks
flowerpower487 I've already done some
would m be 100 because you add 50cm3 and 50cm3 together?
Hi sir, will we ever get asked an exam q for practical techniques for determining equilibrium compositions?
Why are the two volumes added together when calculating the moles?
Sir will they ask us how to set this up or just the calculation?
Thnx so much. These videos r great. Keep it up :)
Zombie Rekz You're welcome. Glad you like them :)
i don't understand how you calculate the moles of water
if the volumes of HCl and NaOH were not the same would you find out the moles left after one of the reactants is completely used up and then take this value as being the same as the moles of H2O?
sophia bonifacio moles of water is determined by the limiting reagent in other words the lowest moles of acid/alkali
Great thanks!
Say if you used h2s04 and naoh would you use the moles of naoh since they have the same ratio?
SidTheSloth Establish the moles of acid and base first, factor in mole ratio to determine which is limiting reagent then work out moles of water
what if they are in equal amounts?
Is the enthalpy change of combustion and neutralisation always negative (exothermic)
The BioChem Guy yup
Thank you so much for these
Using the revision matrix, really enjoying it so far!
Really glad to hear it :)
Crammminng :)))