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Chemistry: Post your doubts here!

Thanks! :)
- andreiaafonso14
- Post #8,839
- May 11, 2014
- Forum: A-Levels
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!
- andreiaafonso14
- Post #8,836
- May 11, 2014
- Forum: A-Levels
A
A level Biology: Post your doubts here!

Thank you so much, that was very helpful!
- andreiaafonso14
- Post #3,784
- May 11, 2014
- Forum: A-Levels
A
New Format of Exams for 2014?

The chemistry data booklet changed? What were the changes? I didn't notice...
- andreiaafonso14
- Post #54
- May 11, 2014
- Forum: A-Levels
A
A level Biology: Post your doubts here!

Hey, can anyone explain sympatric speciation in simple terms to me?
- andreiaafonso14
- Post #3,781
- May 10, 2014
- Forum: A-Levels
A
*Closed*

If someone could please post notes for Biology A2 and Chemistry A2, I would really appreciate it :)
- andreiaafonso14
- Post #7
- Apr 22, 2014
- Forum: A-Levels

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