Posted 27 May 2007 - 12:45 PM
Posted 27 May 2007 - 03:40 PM
Enthalpy changes; enthalpy of combustion, solution, neutralisation
Basic neutralisation ones
Posted 27 May 2007 - 03:49 PM
have never done those PVC ones in my life - should i be worried?
I think we do that triangle instead - n over vc - not sure tho.
Posted 27 May 2007 - 03:52 PM
Posted 27 May 2007 - 03:55 PM
Yep got it now im sure thats what we do was just wondering about that other thing!!
Posted 27 May 2007 - 04:11 PM
Posted 27 May 2007 - 09:47 PM
No. of hydrogen ions x concentration x volume = No. of hydroxide ions x concentration x volume.
I've never seen it come up in a past paper so not sure what its all about.
Posted 28 May 2007 - 07:01 AM
I think I know wot you mean...
Sometimes this type of question comes up in MChoice.
P= the number of H+ or OH- (Power)
V= the volume of solution
C= the concentration
so if you have a question like 'You have 0.1mol/l of HCL and 0.2mol/l of NaOH.Work out the volume of HCl needed to neutraise 200ml of NaOH', first you need to find Power, in this case 1 for both of them.(if H2SO4 is used, the power would be 2 because there are 2 hydrogensi n H2SO4) Then use PVC equation:
PVC(HCl) = PVC(NaOH)
V = 0.4l
I think it's right... Hopefully it makes sense to you
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