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Edexcel ial chemistry - unit 04 - may/june 2019

I need help with this question(picture of question is in attachment). My answer seems to be wrong.
Please guide me on this question.
CH04_01.png56.6KB

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n(NaOH) = 0.045 mol
n(HCl) = 5 x 10^-3 mol
n(CH3COOH) = 0.04 mol

CH3COOH + C2H5OH <-> CH3COOC2H5 + H2O
I 0.12, 0.22, 0, 0.278
E 0.04, 0.14, 0.08, 0.358
Kc = 5.1
(edited 5 years ago)
Reply 2
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Anon#9
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Original post by BobbJo
n(NaOH) = 0.045 mol
n(HCl) = 5 x 10^-3 mol
n(CH3COOH) = 0.04 mol

CH3COOH + C2H5OH <-> CH3COOC2H5 + H2O
I 0.12, 0.22, 0, 0.278
E 0.04, 0.14, 0.08, 0.358
Kc = 5.1

Why did the number of moles of products increase by 0.08 mol? Could you explain it?
Was it because that n(CH3COOH)=n(NaOH)-n(HCl) ?
(edited 5 years ago)
Original post by Saman_B9
Why did the number of moles of products increase by 0.08 mol? Could you explain it?
Was it because that n(CH3COOH)=n(NaOH)-n(HCl) ?

0.08 mol CH3COOH reacted
from stoichiometry
1:1 ratio so 0.08 mol of each product is formed
Reply 4
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Original post by BobbJo
0.08 mol CH3COOH reacted
from stoichiometry
1:1 ratio so 0.08 mol of each product is formed

Yeah, now I understood it
i hv a doubt, so how do we know which substances are more acidic/ basic? injan 2017 ppr q10 how do i know if NH3 OR NaOH is more alkaline?
Original post by Sara03042002
i hv a doubt, so how do we know which substances are more acidic/ basic? injan 2017 ppr q10 how do i know if NH3 OR NaOH is more alkaline?

NH3 weak base
NaOH strong base
so NaOH more alkaline
So shld we memorize which substances are more acidic and basic?
Original post by BobbJo
NH3 weak base
NaOH strong base
so NaOH more alkaline
Reply 8
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t
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Hey, so I just wanted to know when they say 'synoptic assessment' does that include Unit 5 content in our Unit 4 exam?
Reply 9
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Presto
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No no
In u4 it means u1 and u2 content
Original post by t
Hey, so I just wanted to know when they say 'synoptic assessment' does that include Unit 5 content in our Unit 4 exam?
Is there a thread for unit 5 ?
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https://www.thestudentroom.co.uk/showthread.php?t=5787110
Original post by JacobBob
Is there a thread for unit 5 ?
Reply 12
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t
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Okay thanks so much!
Original post by Presto
No no
In u4 it means u1 and u2 content
Can someone send me the unit 4 2019 markscheme? :frown:
Reply 14
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ek2001
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Hello can you plz send me the jan 2019 question paper link plz???
Reply 15
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Anon#9
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Could someone help me with this?
According to https://www.thestudentroom.co.uk/showthread.php?t=4363920, I got the correct answer.
But I don't understand the method.

@charco
WCH04_06.png58.9KB
Original post by Saman_B9
Could someone help me with this?
According to https://www.thestudentroom.co.uk/showthread.php?t=4363920, I got the correct answer.
But I don't understand the method.

@charco


Which question?
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Anon#9
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The image of the question I've attached and the one from that thread are both the same format
I just wanted to know how u explained that.
Original post by charco
Which question?
Original post by Saman_B9
The image of the question I've attached and the one from that thread are both the same format
I just wanted to know how u explained that.

There are two questions ...
Reply 19
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Anon#9
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Which one have you explained? I am only asking that one.

Original post by charco
There are two questions ...

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