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    (Original post by samb1234)
    The equivalence point is the point at which you have mixed an equal number of moles of acid and base. The end point is the point at which the indicator changes colour. If you look at a pH curve, you will notice that there is a steep section for most titrations (except weak acid weak base) and you want your indicators end point to be somewhere in that steep part of the curve. For strong acid strong base, this steep section is approximately from 3-9 so either indicator would work
    (Original post by Ayman!)
    Do you own a Facer text? The end point and equivalence point are very different - the end point is the last point of the vertical region while the equivalence point is the mean of the starting point and the end point of the vertical region.



    Both ranges fall in the vertical region (3 to 11), although I'd say phenolphthalein is a better.
    Thank you so much guys, I really get it now. The book didn't explain it that well at all!
    Another question, when the indicator changes colour, it means that this volume of acid/alkali was enough to neutralise the alkali/acid and this means the end point has been reached but as in methyl orange, it would have changed colour between 3-4.4 but that's below the equivilence point, is that okay for an indicator, although the range lies in the vertical section ?

    Ayman! What is a Facer text? Excuse me if it was some kind of stupid question

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    (Original post by PlayerBB)
    Ayman! What is a Facer text? Excuse me if it was some kind of stupid question

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    Nah, it isn't a stupid question

    It's a textbook - "A level Chemistry" by George Facer. It's a really good reference book and I feel it covers the acid-base chapter really well. I don't even own the Edexcel A2 Chemistry book, didn't have one for AS either!

    Buy one as soon as possible - I feel it also has some good stuff for Unit 6.
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    (Original post by Ayman!)
    Nah, it isn't a stupid question

    It's a textbook - "A level Chemistry" by George Facer. It's a really good reference book and I feel it covers the acid-base chapter really well. I don't even own the Edexcel A2 Chemistry book, didn't have one for AS either!

    Buy one as soon as possible - I feel it also has some good stuff for Unit 6.
    Edexcel textbook is awful imo - i just use chemguide instead for most things
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    (Original post by samb1234)
    Edexcel textbook is awful imo - i just use chemguide instead for most things
    I have those printed out, it's very concise imo, especially for U5.
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    (Original post by Ayman!)
    I have those printed out, it's very concise imo, especially for U5.
    I just use them to make extensive notes tbh, they go more into why stuff happens instead of just what happens
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    (Original post by Ayman!)
    Nah, it isn't a stupid question

    It's a textbook - "A level Chemistry" by George Facer. It's a really good reference book and I feel it covers the acid-base chapter really well. I don't even own the Edexcel A2 Chemistry book, didn't have one for AS either!

    Buy one as soon as possible - I feel it also has some good stuff for Unit 6.
    I didn't have one for As but yeah the A2 Edexcel book as awful!! It doesn't things as clear as I need them to be!

    I will, massive thanks
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    (Original post by Science_help)
    Lets see who gets this right.
    No using google or textbook btw.

    What temperature does diamond melt at ? nearest 100
    Hahah is this a trick? Diamond doesn't melt does it ? It burns
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    (Original post by namenert)
    Hahah is this a trick? Diamond doesn't melt does it ? It burns
    yep, your right, but it sublimes
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    Can someone help me withe questions like these please? Is there a method to figuring out the right equation? The catalyst reactions in the book i can memorise and just write down when asked but these two I actually have to work out and write but I keep getting them wrong.If someone has a good way of working out the equations please let me know.

    http://filestore.aqa.org.uk/subjects...5-QP-JUN12.PDF Q8b
    http://filestore.aqa.org.uk/subjects...5-QP-JUN13.PDF Q8a
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    Hey ,

    During an observation excerise, i got cream ppt with nitric acid and silver nitrate and adding dilute ammnonia there was no visible change, this suggests that contains iodide ions. But, when i added sodium hydroxide, it give a white ppt
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    Hey guys any CCEA people here? How do you feel for tomorrow?
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    Hey! I'm doing CCEA chemistry tomorrow! I'm quite nervous for it even though you don't have to revise anything for it! how does everyone feel about booklet b next week???
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    btw, how much chemistry revision has everyone done.....ive done so little!!!
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    So.. with only a few weeks to go, how is everyone feeling about the Chemistry exams?
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    anybody done chem 6 x written paperrr!!?/ helppppppp
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    (Original post by KatieAlicexxx)
    So.. with only a few weeks to go, how is everyone feeling about the Chemistry exams?
    Definitely nervous..
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    (Original post by haj101)
    Definitely nervous..
    Join the club! How much revision have you been doing?

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    (Original post by KatieAlicexxx)
    Join the club! How much revision have you been doing?

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    Quite a bit tbh, I've been through the past papers a number of times and I'm working on the questions I find difficult...
    How's your revision going?
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    (Original post by haj101)
    Quite a bit tbh, I've been through the past papers a number of times and I'm working on the questions I find difficult...
    How's your revision going?
    Nice! Yeah I'm pretty much the same, done all the papers about 4 times- however, just done my 2015 f334 mock and I got a C 😞 upsetting as I've been getting As in the rest of the papers, but that was a hard paper I guess!
    What exam board are you on?

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    (Original post by KatieAlicexxx)
    Nice! Yeah I'm pretty much the same, done all the papers about 4 times- however, just done my 2015 f334 mock and I got a C 😞 upsetting as I've been getting As in the rest of the papers, but that was a hard paper I guess!
    What exam board are you on?

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    AQA for me but I totally understand where you are coming from, i also found the style of the 2015 papers a lot different to the the other past papers that I have been practising on... They managed to sneak in quite a few application questions tbh..
    Main advice is to write down all the questions you don't understand use your notes and revision guide to fill in the gaps in your content knowledge...
    Good luck! Hope you get what you want X
 
 
 
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