Chemistry: Post your doubts here!

[Rizwan Javed]

Can anyone tell me from where I can practice questions relating to IR spectrometer?

 

[Kiara P.]

Can anyone tell me from where I can practice questions relating to IR spectrometer?

Have you done the book/past paper questions first?

 

[Rizwan Javed]

Have you done the book/past paper questions first?

It's a new addition to the AS syllabus, so no past papers yet. But I have done the book.

 

[ashcull14]

why do we consider 0.2moldm^-3 due to Fe3+ ions

 

[Awesome12]

View attachment 60400
why do we consider 0.2moldm^-3 due to Fe3+ ions

There are 2 iron atoms in Fe2(SO4). The reaction shown only involves 1 Iron (III) atom.

 

[ashcull14]

There are 2 iron atoms in Fe2(SO4). The reaction shown only involves 1 Iron (III) atom.

if it involves onle one Fe3+ then y do we mutiply the conc wid 2....SO42- = weak base ...it doesnt affect the pH...isnt tht so?

 

[Awesome12]

if it involves onle one Fe3+ then y do we mutiply the conc wid 2....SO42- = weak base ...it doesnt affect the pH...isnt tht so?

I didnt really understand your question but from what i understand:
We multiply it by 2 as the conc of Fe2(SO4)3 is 0.1. The equation is given for just 1 mole, [Fe(H20)6]^+2 is the same as Fe^+3 (aq).
The acid dissociation constant will stay the same as a change in conc. Of the acid will also change the conc of the products. Thus we need not worry about Ka and just use the conc. Of the acid as 0.2

Generally speaking, t does affect the pH but only to a very small extent, that WE can term it negligible, For stronger acid, the change is greater which is why we say there is a change.

Again i didnt quite understand what was your question, so i just typed in what I assumed you were asking

 

[Saad the Paki]

Can anyone tell me from where I can practice questions relating to IR spectrometer?

If you find something please share them here. I'm also not very well prepared regarding IR spectroscopy.

 

[Rizwan Javed]

If you find something please share them here. I'm also not very well prepared regarding IR spectroscopy.

Someone told me that this topic can be practiced from the edexcel past papers. I'll share the questions here soon which I found. But if you like you can see the past papers on your own as well.

 

[The Sarcastic Retard]

Someone told me that this topic can be practiced from the edexcel past papers. I'll share the questions here soon which I found. But if you like you can see the past papers on your own as well.

May this help you, found on net.

 

[Rizwan Javed]

May this help you, found on net.

Thanks

 

[princess Anu]

Help part b iv

 

[techgeek]

Anybody found questions on IR spectroscopy in Edexcel papers?

 

[Rizwan Javed]

Anybody found questions on IR spectroscopy in Edexcel papers?

I'll be adding more..

Answer: C

 

[Rizwan Javed]

Marking Scheme:
Absorption due to OH (stretch)/
Peak due to the OH
ALLOW
Alcohol/hydroxyl group

 

[techgeek]

I'll be adding more..
View attachment 60425
Answer: C

thank you so much, could you explain that a little also please? because I didn't get that much from the book

 

[techgeek]

I also found some but from OCR


and the ms:

 

[techgeek]

And this one from AQA:

ms

 

[techgeek]

Different variants have same kind of questions?
I solved all variant 11s now I came back to 12 ones and they all basically seem the same

 

[TariqBhai]

Different variants have same kind of questions?
I solved all variant 11s now I came back to 12 ones and they all basically seem the same

Solve OCR papers then