Hi Ultima, got two questions for you, hope you don't mind.
For planning I did thermometric titration like the one in
Wikipedia whereby you do titration and measure end point through
temperature instead of volume. But all my friends say must keep
volume constant which is not possible for thermometric titration.
Are they wrong or am I missing something. If I am not wrong, the
Qns did ask us to do that right.
As for the catalysed reaction rate graph, shouldn't it be a
steeper straight line graph? Cause it is not a biological
catalyst(I think so, I forget the Qns already).
The procedure described in Wikipedia is right, don't let your
friends make you worry.
http://en.wikipedia.org/wiki/Thermometric_titration
And don't worry about losing a coupe of marks here and there for
Planning. In fact, even if you totally skip the entire planning
question but as long as you get all other questions in P2, P3 and
P1 (almost) all correct, you can still get your A grade. No
worries.
Actually the question *did* specify the catalyst was an enzyme. No
worries lah. As long as your graph looks something like this one
can liao.
If these are your main worries from P2, it means you probably can
get a high A grade (ie. > 80%) for P2. As I already said earlier
in this thread, overall cut-off % to get A will be approx 75%. Just
don't screw up P3 and P1, and you should get your A no probs.
