legache
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Hi!
I am really confused about a bit of Q3)ii), which I think should be really simple but I just don't know how the amount of butanoic acid is 0.01mol! I keep getting 0.125.

Paper: http://www.ocr.org.uk/Images/131289-...d-elements.pdf
Mark scheme: http://www.ocr.org.uk/Images/135166-...ments-june.pdf

If anyone could explain how to get this answer, I'd be really grateful!!
Thanks.

(I thought I was pretty confident with buffer pH but obviously not as I got confused and just used the concs in the Q so I got 4.12. I tried to do something to get salt, not OH conc but was running out of time so I stopped)
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TheLegalDealer
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(Original post by legache)
Hi!
I am really confused about a bit of Q3)ii), which I think should be really simple but I just don't know how the amount of butanoic acid is 0.01mol! I keep getting 0.125.

Paper: http://www.ocr.org.uk/Images/131289-...d-elements.pdf
Mark scheme: http://www.ocr.org.uk/Images/135166-...ments-june.pdf

If anyone could explain how to get this answer, I'd be really grateful!!
Thanks.

(I thought I was pretty confident with buffer pH but obviously not as I got confused and just used the concs in the Q so I got 4.12. I tried to do something to get salt, not OH conc but was running out of time so I stopped)

for c ii) ?
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legache
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(Original post by TheLegalDealer)
for c ii) ?
Oh yes, 3)c)ii)
Sorry I forgot to mention that!!
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TheLegalDealer
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(Original post by legache)
Oh yes, 3)c)ii)
Sorry I forgot to mention that!!
The answer is explained in this thread hope it helps !

http://www.thestudentroom.co.uk/show....php?t=2213250
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legache
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Thanks that's perfect!!
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TheLegalDealer
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(Original post by legache)
Thanks that's perfect!!

It sounds so simple but I still don't get how they did it
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legache
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(Original post by TheLegalDealer)
It sounds so simple but I still don't get how they did it
I just took a look and tried it again and I understand it now. Shall I explain it to you?
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TheLegalDealer
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(Original post by legache)
I just took a look and tried it again and I understand it now. Shall I explain it to you?
Worked it out eventually , thanks anyway !
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legache
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(Original post by TheLegalDealer)
Worked it out eventually , thanks anyway !
You're welcome!! Thanks for sending me that link it saved me haha
Good luck this summer
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TheLegalDealer
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(Original post by legache)
You're welcome!! Thanks for sending me that link it saved me haha
Good luck this summer
You too !
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