Danyal124
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Help!!!!!! Very stuck could some one explain how to do these questions as I know how to identify a strong or weak acid by a graph but the options it gives you I can’t recognise if they’re strong acid or weak base...
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charco
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(Original post by Danyal124)
Help!!!!!! Very stuck could some one explain how to do these questions as I know how to identify a strong or weak acid by a graph but the options it gives you I can’t recognise if they’re strong acid or weak base...
Strong acid (0.1 mol dm-3) will start off at pH1
Strong base (0.1 mol dm-3) will start off at pH13

Typical weak acid (0.1 mol dm-3) will start off at about pH3
Typical weak base (0.1 mol dm-3) will start off at about pH11
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Danyal124
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Help!!!!!! Very stuck I know how to identify a strong acid weak base graph and the rest of them I can understand which was poured from berette either acid or base. But I can’t tel from the options given if they’re strong based or acids...
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positivity4
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(Original post by Danyal124)
Help!!!!!! Very stuck I know how to identify a strong acid weak base graph and the rest of them I can understand which was poured from berette either acid or base. But I can’t tel from the options given if they’re strong based or acids...
Imageunderstand/memorise the pH graph curves Image




then find out what ammonia acts as - it's a weak base
HCL - strong acid
can you see there isn't a distinct equivalence point
ALso look out for the pH strong acid have a pH of abt 3
Hope this helps
let me know x
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Danyal124
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(Original post by positivity4)
Imageunderstand/memorise the pH graph curves Image




then find out what ammonia acts as - it's a weak base
HCL - strong acid
can you see there isn't a distinct equivalence point
ALso look out for the pH strong acid have a pH of abt 3
Hope this helps
let me know x
everything you have stated im comfortable with its only the options they give you that puts me off ie how do i know if hcl is a strong acid or ammonias is a weak base . i can ditinguish which is acid or base but cant see how its weak or strong by its name alone
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Anon???
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You are meant to remember the key ones :/
So like HCl and ammonia are ones you should remember
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Anon???
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And then you know carboxylic acids are weak acids

NaOH, KOH are a strong alkali etc
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T.E.Lawrence
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(Original post by Danyal124)
everything you have stated im comfortable with its only the options they give you that puts me off ie how do i know if hcl is a strong acid or ammonias is a weak base . i can ditinguish which is acid or base but cant see how its weak or strong by its name alone
Watch a video to gain better understanding. MaChemGuy for OCR A
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positivity4
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(Original post by Anon???)
You are meant to remember the key ones :/
So like HCl and ammonia are ones you should remember
yhh exactly does make life easy
(Original post by Anon???)
And then you know carboxylic acids are weak acids

NaOH, KOH are a strong alkali etc
yepp it's easy then on
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omarsharif8
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(Original post by T.E.Lawrence)
Watch a video to gain better understanding. MaChemGuy for OCR A
Or Davies Chemistry for AQA
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Davies Chemistry
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(Original post by omarsharif8)
Or Davies Chemistry for AQA
Thanks!
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