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    (Original post by kevintai0901)
    guys just a random question.

    Are we supposed to know how to name complex ions? (eg. hexaaquacopper(II) ion). The naming rules are just killing me.
    Yeah we do
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    (Original post by kevintai0901)
    guys just a random question.

    Are we supposed to know how to name complex ions? (eg. hexaaquacopper(II) ion). The naming rules are just killing me.
    Yes and also the colour. I ahd to do it in one of the Exam papers.
    http://www.chemguide.co.uk/inorganic...ons/names.html
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    (Original post by kevintai0901)
    guys just a random question.

    Are we supposed to know how to name complex ions? (eg. hexaaquacopper(II) ion). The naming rules are just killing me.
    Yes we are,

    Name the ligand/s first with the prefix for how many , then name the transition metal and depends if its negative or neutral/positive on what version of the name it will take along with the oxidation state.
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    (Original post by radhikagulati)
    What's the difference between a by-product and waste product? I saw it in an F335 paper somewhere and it could come up in f334 i guess

    (sorry for posting loads I'm annoying i know)
    By product is a result of a reaction i guess it could be useful? a waste product has no use so its a waste product but i am sure someone will use f332 revise book that i lost to give you a better answer.
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    I am gonna sleep at 3am i know i won't be able to sleep and go college at 10:30 for a revision session.
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    (Original post by EggsterminateMe)
    Hey Chem kid! Yes yes I remember you. (I wonder how the others are) I also got a C and also retaking F335. All of this is gonna be a pain in the butt for me. I feel as if i knew more last year than this.
    Good good I'm glad, yes I bet they are great we had an actual amazing (and interesting) group last year, it does not feel as daunting now I know somebody going through with me, I know what you mean I have not been revising intensely as I did last year trying to go with the calm relaxed approach this time. You ready?
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    (Original post by MathsAddict)
    By product is a result of a reaction i guess it could be useful? a waste product has no use so its a waste product but i am sure someone will use f332 revise book that i lost to give you a better answer.
    Thanks!
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    (Original post by KittenMittens)
    Do you have bullet points for the process of doing a titration, its the practical technique i'm least familiar with and I don't think its in the notes you made? The notes are great btw so thanks!
    Aww, thank you, & sure!

    Acid-base titration:
    1 - Fill your burette to zero with the solution of known conc (-in all the scenario is I've seen, this is usually the alkali).
    2 - Using a pipette, transfer a known volume of your solution of unknown conc into a conical flask (-again, this is usually the acid from the scenarios I've seen!).
    3 - Add in a few drops of suitable indicator, such as methyl orange or phenolphthalein. (-ONLY if it is a titration that requires indicators! Titrations with potassium permanganate do not require any indicators!)
    4 - Start the titration, swirling the conical flask throughout; when you first see a colour change, immediately turn down the tap on the burette, so the solution of known conc is added drop-wise.
    5 - When a permanent colour persists for 20 seconds, stop the titration & record the titre value in a table. (-For permanganate titrations, the end of the titration will be 'when a permanent pink'.)
    6 - Repeat the titration until you have 2 concordant results (i.e. 2 titres within 0.1cm^3 of each other), then calculate the average of these titres.

    There are 2 redox titrations in F334:
    -Potassium manganate(VII) titrations - this an additional step of acidifying the solution of unknown conc, after transferring into the conical flask (step 2 above) -the rest of the steps are the same. (-KMnO4 is a strong oxidising agent, so can be used to find conc's of solutions containing Fe2+ ions or H2O2, through redox titrations.)

    -Iodine-thiosulfate titrations - this is used to determine the conc of oxidising agents; it involves an additional step BEFORE carrying out the titration above: react a known vol of the oxidising agent with an excess of acidified potassium iodide solution. The iodine that is produced can then be titrate against sodium thiosulfate; also, towards the end of the reaction, add a few drops of starch solution. This will give an intense blue-black colour that will fade to clear at the end point.

    Sorry this is so long, I hope it helps!
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    My revision guide says polydentate is more than two coordinate bonds formed, but isn't it two or more? (or more than one?)
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    Don't worry people.
    Don't worry.
    I will be here to lower the grade boundary.
    You are all welcome.
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    if something has 4 pairs of electrons how do you know if its square planar or tetrahedral?
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    some help me on june 2012 5 b iii how is it a cordination number of 6 i know edta4- is a polydentate so how many bonds can it form? 6? why 6 why not 4?
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    (Original post by nats927)
    if something has 4 pairs of electrons how do you know if its square planar or tetrahedral?
    You don't- the mark scheme allows for both
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    (Original post by thedontom)
    My revision guide says polydentate is more than two coordinate bonds formed, but isn't it two or more? (or more than one?)
    more than 2 is polydentate 2 is bidentate
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    (Original post by ThePhoenixLament)
    You don't- the mark scheme allows for both
    cool thankss
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    (Original post by chemistrykid123)
    Good good I'm glad, yes I bet they are great we had an actual amazing (and interesting) group last year, it does not feel as daunting now I know somebody going through with me, I know what you mean I have not been revising intensely as I did last year trying to go with the calm relaxed approach this time. You ready?
    same, trying to be more relaxed. And I believe many people got Cs in chem due to f334. But, in sha allah, this time there will be success!!
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    do we really have to know how to name ligands, havent seen a past paper question about it???
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    Some notes.
    Attached Images
  1. File Type: pdf F334.pdf (229.5 KB, 206 views)
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    (Original post by Jaz_ace)
    do we really have to know how to name ligands, havent seen a past paper question about it???
    dont take any chances they might exploit weak points revise it as well know everything and enter the exam confidently.
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    (Original post by MathsAddict)
    some help me on june 2012 5 b iii how is it a cordination number of 6 i know edta4- is a polydentate so how many bonds can it form? 6? why 6 why not 4?
    It forms 6 due to 6 lone pairs, it just has a +4 charge on the ion (not related to coordination number)
 
 
 
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