Ok guys, despretly need help here 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

**0**

# Calculations

Started by gordon_mfc, May 27 2007 12:45 PM

8 replies to this topic

### #1

Posted 27 May 2007 - 12:45 PM

### #2

Posted 27 May 2007 - 03:39 PM

Eh? what?

Chemical Engineering - Edinburgh

*Conditional*### #3

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

Enthalpy changes; enthalpy of combustion, solution, neutralisation

Basic neutralisation ones

Volumetric Titrations

Hess's Law

Half Life

Quantitative Electrolysis

Percentage Yield

Chemical Engineering - Edinburgh

*Conditional*### #4

Posted 27 May 2007 - 03:49 PM

Ok guys, despretly need help here 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

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

Posted 27 May 2007 - 03:52 PM

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

Chemical Engineering - Edinburgh

*Conditional*### #7

Posted 27 May 2007 - 04:11 PM

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

Chemical Engineering - Edinburgh

*Conditional*### #8

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.

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

Posted 28 May 2007 - 07:01 AM

Ok guys, despretly need help here 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

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... Hopefully it makes sense to you

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