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    (Original post by samb1234)
    Cr 3+ is technically violet, it's just that almost every reaction you would ever do with it involves some ligand exchange hence the green
    Yep I was just about to add that

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    http://www.chemguide.co.uk/inorganic.../chromium.html
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    (Original post by Serine Soul)
    Yep I was just about to add that

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    http://www.chemguide.co.uk/inorganic.../chromium.html
    yep I suspect it is a classic example of chemguide going well beyond what you need to know but oh well
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    (Original post by pineneedles)
    More or less than you hate plants? :P

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    Yeah lol. You might be able to tell that I'm quite miserable when it comes to these two subjects
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    (Original post by samb1234)
    yep I suspect it is a classic example of chemguide going well beyond what you need to know but oh well
    So just getting things clear. It should be violet in aqueous solution without other ligands such as chloride ions but for the sake of the spec we say it's green? But really it's only green with, for example, 2 chloride ions acting as ligands?


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    (Original post by thad33)
    So just getting things clear. It should be violet in aqueous solution without other ligands such as chloride ions but for the sake of the spec we say it's green? But really it's only green with, for example, 2 chloride ions acting as ligands?


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    find out what your spec wants you to know and go for that
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    f324/f325 topic predictions guys? :P
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    (Original post by bakedbeans247)
    f324/f325 predictions guys? :P
    ez a*
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    (Original post by alow)
    ez a*
    I meant in terms of topic lol :P But gl!
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    (Original post by bakedbeans247)
    f324/f325 topic predictions guys? :P
    40 marks on mechanisms F324 :drool:

    70 marks on entropy and enthalpy F325 :coma:
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    (Original post by pineneedles)
    This reaction is happening:

    HCOO- + H+ > HCOOH
    When the salt reacts with H+, more acid is produced
    Hence when the moles of salt decreases by 5x10^-4, the moles of acid increases by the same amount

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    I get it now, thanks
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    (Original post by Serine Soul)
    40 marks on mechanisms F324 :drool:
    Omg YESSSSSS!!! :awesome: If only...
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    getting so frustrated with f324 ahhh
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    The recommended adult dose of chloral hydrate as a sedative is 250 mg, threetimes a day. Calculate the mass of trichloroethanal you would need to react with water tomake one week’s supply of chloral hydrate for an adult, assuming a 60% yield.Mr: chloral hydrate, 165.5; trichloroethanal, 147.5




    mass of trichloroethanal = g

    Anyone else getting 7.41g or?
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    (Original post by Hunnybeebee)
    The recommended adult dose of chloral hydrate as a sedative is 250 mg, threetimes a day. Calculate the mass of trichloroethanal you would need to react with water tomake one week’s supply of chloral hydrate for an adult, assuming a 60% yield.Mr: chloral hydrate, 165.5; trichloroethanal, 147.5




    mass of trichloroethanal = g

    Anyone else getting 7.41g or?
    What would be the dose for a week?
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    (Original post by TeachChemistry)
    What would be the dose for a week?
    250/1000 = 0.25g per dose x 3 = 0.75g per day x 7 = 5.25g
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    (Original post by Hunnybeebee)
    250/1000 = 0.25g per dose x 3 = 0.75g per day x 7 = 5.25g
    Agreed. How many moles is this?

    Assuming 60% yield how many miles of starting material are needed?

    What mass of starting material is this?
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    I can't tell if I'm confusing myself here but how do we know which peak the protons are from in proton NMR? (The ones I circled) I don't even know how to ask this question properly but hoping someone understands me lol Name:  ImageUploadedByStudent Room1465077016.212644.jpg
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    (Original post by Saywhatyoumean)
    I can't tell if I'm confusing myself here but how do we know which peak the protons are from in proton NMR? (The ones I circled) I don't even know how to ask this question properly but hoping someone understands me lol Name:  ImageUploadedByStudent Room1465077016.212644.jpg
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    You only circled one proton...
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    (Original post by alow)
    You only circled one proton...
    Yeah but I mean which peak would that proton be for the chemical shift values? The H-C-O or the H-C=O?


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    (Original post by Saywhatyoumean)
    Yeah but I mean which peak would that proton be for the chemical shift values? The H-C-O or the H-C=O?


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    What do you mean?
 
 
 
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