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  1. A

    Chemistry: Post your doubts here!

    Thanks! :)
  2. A

    Chemistry: Post your doubts here!

    NEED HELP PAPER 4 CHEMISTRY Question says: Calculate the pH of the buffer formed when 10.0cm3 of 0.100 mol dm-3 NaOH is added to 10.0cm3 of 0.250 mol dm-3 CH3CO2H, whose pKa=4.76. I keep getting the wrong concentrations for the salt and acid according to the mark scheme... HELP!
  3. A

    A level Biology: Post your doubts here!

    Thank you so much, that was very helpful!
  4. A

    New Format of Exams for 2014?

    The chemistry data booklet changed? What were the changes? I didn't notice...
  5. A

    A level Biology: Post your doubts here!

    Hey, can anyone explain sympatric speciation in simple terms to me?
  6. A

    *Closed*

    If someone could please post notes for Biology A2 and Chemistry A2, I would really appreciate it :)
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