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QCE Chemistry Questions Thread
jasmine24:
Hi, I was wondering how to identify the endpoint on a titration curve. I know its when the indicator changes colour but im not sure how this could be identified by just looking at the curve
Thanks!
Bri MT:
--- Quote from: jasmine24 on January 19, 2021, 04:05:57 pm ---Hi, I was wondering how to identify the endpoint on a titration curve. I know its when the indicator changes colour but im not sure how this could be identified by just looking at the curve
Thanks!
--- End quote ---
Hi!
You know that bit where the curve goes really steep? Like it's basically straight-up? That's what you're looking for
no worries :)
jasmine24:
--- Quote from: Bri MT on January 19, 2021, 04:09:08 pm ---Hi!
You know that bit where the curve goes really steep? Like it's basically straight-up? That's what you're looking for
no worries :)
--- End quote ---
So is it the whole steep part? I was working on a question from my textbook with a graph sort of like the one i attached and it said the endpoint was at the point i labelled and I'm confused as to how it is
Thank you
Bri MT:
The equivalence point is in the "middle" of the steep part and the end point is a little bit past that (slightly more volume). Like how when you wait for the colour change, we tend to approximate the equivalence point and end point as being achieved by the same volume
jasmine24:
Hi, would anyone be able to explain dataset 1 - item 3. Im not sure how pKa = 14 - 9.2 as i thought at the half-equivalence point pKa = pH
TIA :)
Question: https://www.qcaa.qld.edu.au/downloads/senior-qce/sciences/snr_chemistry_19_ia1_smple_ass_inst.pdf
Answers: https://www.qcaa.qld.edu.au/downloads/senior-qce/sciences/snr_chemistry_19_ia1_smple_m_scheme.pdf
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