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    you forgot to square it dumbass xD
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    I wasn't sure about why the salt was slightly alkaline at the temperature either... I worked out that the pH of water at that temperature was around 6, so I just said that the salt is slightly alkaline to cancel the acidity of the water out? I have no clue :')
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    What did people get ffor the. Question on why a salt dissolved in water had a ph higher then 7 and kw of water
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    (Original post by studygirl300)
    What did people get ffor the. Question on why a salt dissolved in water had a ph higher then 7 and kw of water
    I said that the salt anion absorbs H+ and it's only slightly alkaline because kw was low so not many H+ in solution to be absorbed
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    Ok thanks thats what i said
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    What indicator did you put?
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    (Original post by Pixie1234)
    What indicator did you put?
    I think the indicator was Starch due to the Iodine?
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    Anyone think the two 6 markers were overly mean. they never ask about precipitate reactions of complexes and they just shove a QWC in on it where u have to remember the observations and the formula! Same for the QWC in Q5, were we really supposed to remember all those reactions?!
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    Do you think the marking boundaries will be higher or lower than last year?
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    (Original post by SackSly)
    I think the indicator was Starch due to the Iodine?
    I put that too! What about when you had to choose which indicator to use for the titration curve??
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    (Original post by matthewdjones)
    Anyone think the two 6 markers were overly mean. they never ask about precipitate reactions of complexes and they just shove a QWC in on it where u have to remember the observations and the formula! Same for the QWC in Q5, were we really supposed to remember all those reactions?!
    It wasn't complex precipitates it was just copper ions with OH ions for the precipitate
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    Anyone remember what the got Gibbs free energy question?
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    (Original post by ALevel Student 1)
    I calculated the H+ and OH- concentrations and found that the OH- conc was higher than H+ so it was alkaline
    Answers I got, cant remember what for:
    think maybe for rate mol-1dm3s-1
    0.083 NaOH conc
    530 for entropy change
    0.78 for something, cant remember what
    59.5% copper
    W and Y were the acids used because of inital ph. The indicator was the one with 8.0-9.6 range
    7.29 x 10^-5 atm-2 for the kp I think
    -891 for the Born Haber one
    Let me know what you guys think.
    I thought it was a straightforward paper and expect boundaries not to fluctuate much from last year.
    I got these, the one I was most worried about was the kp one but I got that
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    (Original post by Pixie1234)
    Anyone remember what the got Gibbs free energy question?
    -20ish
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    (Original post by SackSly)
    I think the indicator was Starch due to the Iodine?
    Put Starch too ) Hope its right
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    H+ Had order 1, I- had order 0. So what was the rate equation?
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    (Original post by marethyu)
    -20 kJ ish


    Yeah I'm almost certain its starch



    k(h+)(CH3COOCH3)
    -20 kJmol^-1K^-1ish
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    (Original post by marethyu)
    -20 kJ ish



    Yeah I'm almost certain its starch



    k(h+)(CH3COOCH3)
    perfect thanks
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    I got -860kJmol -1 for the born haber cycle for formation of BaCl2 and go -22.94 for the gibbs free energy change

    Also got 59.5% copper content in the brass and 0.083 for NaOH concentration

    Got 4.9x10-5 somewhere too I think, aswell as 7.0x105?
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    (Original post by ishanS)
    -20 kJmol^-1K^-1ish
    20 kJmol^-1 ish

    Units werent required anyway
 
 
 
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