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Calculations - HSN forum

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Calculations


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#1 gordon_mfc

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Posted 27 May 2007 - 12:45 PM

Ok guys, despretly need help here ohmy.gif how do you do the PVC=PVC calculations and for that matter can someone give me a list of all the types of calculations i need to revise.

Cheers
Gordon
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#2 BuckminsterFullerene

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Posted 27 May 2007 - 03:39 PM

Eh? what?
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#3 BuckminsterFullerene

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Posted 27 May 2007 - 03:40 PM

Excess
Enthalpy changes; enthalpy of combustion, solution, neutralisation
Basic neutralisation ones
Volumetric Titrations
Hess's Law
Half Life
Quantitative Electrolysis
Percentage Yield
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#4 celticfcz

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Posted 27 May 2007 - 03:49 PM

QUOTE(gordon_mfc @ May 27 2007, 01:45 PM) View Post
Ok guys, despretly need help here ohmy.gif how do you do the PVC=PVC calculations and for that matter can someone give me a list of all the types of calculations i need to revise.

Cheers
Gordon
x


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.

#5 BuckminsterFullerene

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Posted 27 May 2007 - 03:52 PM

Just remember n = cv (Number of moles = Concentration x Volume)
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#6 celticfcz

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Posted 27 May 2007 - 03:55 PM

QUOTE(BuckminsterFullerene @ May 27 2007, 04:52 PM) View Post
Just remember n = cv (Number of moles = Concentration x Volume)


Yep got it now im sure thats what we do was just wondering about that other thing!!


#7 BuckminsterFullerene

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Posted 27 May 2007 - 04:11 PM

PVC, not sure, though I think its just an adopted synonym for N = cv calculations?
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#8 Hassan

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Posted 27 May 2007 - 09:47 PM

Do you mean volumetric titrations?

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.

#9 Arisa

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Posted 28 May 2007 - 07:01 AM

QUOTE(gordon_mfc @ May 27 2007, 12:45 PM) View Post
Ok guys, despretly need help here ohmy.gif how do you do the PVC=PVC calculations and for that matter can someone give me a list of all the types of calculations i need to revise.

Cheers
Gordon
x


I think I know wot you mean...
Sometimes this type of question comes up in MChoice.
PVC:
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)
1*V*0.1=1*0.2(in liters!)*0.2
0.1V=0.04
V = 0.4l

I think it's right... dry.gif Hopefully it makes sense to you





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