Qualification > Sciences

Indicators

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XaM!!:
can u plz answer those pprz ques???

CHEMMASTER6000:
which papers are they? p1 p2 p3 p4 p5?

XaM!!:

--- Quote from: inverse tangent graph on May 24, 2010, 03:29:03 pm ---which papers are they? p1 p2 p3 p4 p5?

--- End quote ---

p3

CHEMMASTER6000:
UMM dude its passed already.  :o

Chingoo:
Actually, they haven't passed already. There are in total four practical papers and as far as I know, 33 has it's Physics today and 34 is yet to test for all exams.

I'm not referring to a particular practical question, but the rules for choosing an indicator are:
1) If the titration is between a weak base and strong acid, use methyl-orange/screened methyl-orange indicator.
2) If the titration if between a strong base and weak acid, use phenolphthalein indicator.
3) If the titration is between a strong base and strong acid, you can use either indicator.

I'm not sure for a weak base and weak acid, but I believe that is beyond the scope of our practicals.

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