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    (Original post by Dylann)
    Good question and very difficult to answer...you probably don't have to know why for a-level. Just remember hydroxide solubility increases down the group and sulfate solubility increases up the group.

    If you have the time (and concentration) then this might help:

    http://www.chemguide.co.uk/inorganic.../problems.html

    Oh okay. Thanks a lot!
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    Hello, could anyone help me out solving a problem. Cannot get the concept of how to solve it.
    How many grams of 25% solution you have to pour into 5kg, 30% solution to get 27% solution.
    Thank you
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    (Original post by Dylann)
    Ok so because there are two H+ ions per H2SO4 molecule all you do is double the concentration of H2SO4. Then, figure out which value is smaller, the moles of H+ (2xh2so4 moles) or NaOH. This will be your moles reacted, and you should be able to do the rest

    quote if you have anymore problems
    Oh, right Thanks I finally get it now ... Yayy
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    (Original post by BBeyond)
    Didn't know there was a copper award? I thought it was just bronze silver gold
    I didn't do it today, my Chemistry teacher prolonged it to Thursday

    Nope, its Copper, Silver and Gold based on the elements in that group :lol:
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    I had an exam where it asked why magnesium hydroxide couldn't be used instead of calcium hydroxide [lime water] for a CO2 test. I put because magnesium carbonate is very soluble so wouldn't precipitate out to make the solution cloudy but just dissolve, whereas others said it was because magnesium hydroxide is insoluble. Which answer seems right?
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    (Original post by Hayley Williams)
    Start revising little by little now so the knowledge become second nature! You can't wing chemistry, just a word of warning lol I've seen lots of people try and it doesn't work hope all goes well


    Posted from TSR Mobile
    Thanks for the reply!! I've been trying to go over all the stuff we've covered as I understand most of it but don't phrase it in the right way at times so I've been trying to express ways in which the mark scheme wants :P And I had no plans of winging chemistry - going for that A! Thanks again!
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    Hi, i'm doing AQA chemistry
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    (Original post by haemo)
    Same
    Are you doing AS or A2?
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    (Original post by haemo)
    AS, you?
    AS as well
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    any tips for the titration practicals??
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    (Original post by SubwayLover1)
    any tips for the titration practicals??
    Make sure to take the funnel out of the top of the burette, ensure you wash out your conical flask with distilled water after each titration, measure using your piper very carefully, record to 2 dp, with the 2nd number being a 0 or a 5!
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    (Original post by Nidfeo)
    Make sure to take the funnel out of the top of the burette, ensure you wash out your conical flask with distilled water after each titration, measure using your piper very carefully, record to 2 do, with the 2nd number being a 0 or a 5!
    Thanks!!!
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    Also chemistry jokes.

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    (Original post by haemo)
    Energetics is such a lovely topic
    I love that too, especially equilibrium!


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    (Original post by Jalal Uddin)
    Also chemistry jokes.

    Sodium hypobromite


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    If anybody is struggling with the energetics topic, check out Sara Sephton on youtube. She also has a very detailed video on Group 7, so also check that out if you can!
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    (Original post by SubwayLover1)
    any tips for the titration practicals??
    Read off the miniscus (the bottom of the curve). Also go dropwise when you're about 4cm3 away.

    Estimate the finish point of your subsequent titrations and try hard to get concordant results!

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    (Original post by zhang-liao)
    I didn't do it today, my Chemistry teacher prolonged it to Thursday

    Nope, its Copper, Silver and Gold based on the elements in that group :lol:
    Nope it's definitely Bronze Silver Gold. It's the standard three levels of achievement (used in Olympics, hence Olympiad too). You're right that Copper is in the same group, but Copper (with Tin) is a constituent of Bronze.

    You're possibly getting confused with the C3L6 challenge, where Copper and Roentgenium are used as they lie in the same group as Silver and Gold! (Rg is the highest award, there's also Entry before Cu)

    Additionally, I remember you saying you were due to sit the Olympiad today, how was it? Must have been exceptionally difficult for an AS student, so I hope you didn't give up!

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    (Original post by haemo)
    Have you started it?
    nope
    have you?
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    I'm doing OCR AS

    How many assessed practicals have people done, I've done 1 qual 1 quant?
 
 
 
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