“Hey can you pleaseeeeeeeeeeeeeeee help me with a qn.
This is for the chemistry spa I would be sitting tmr (SEC 3)
During an acid base titration, what are the possible sources of experimental error?
It would be great If I could get a reply today bcos as I have mentioned earlier I am sitting for the science practical O LEVELS tmr!!”
THANKS.
Three most common ones are:
1) Parallax Error – Wrong placing of the eye while taking readings
2) Meniscus reading – Should be done at the bottom of the meniscus curve, not above or within the curve
3) Washing of the conical flask with analyte before titration. This causes additional amount of analyte to be included into the flask (in addition to the actual amount that you intended to pipette in)
Sean
www.SimpleChemConcepts
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HI(: I’ll be sitting for pure chemistry “o” level SPA on friday. The topic is acid, bases and salt without qualitative analysis. I don’t really have any idea on what possible experiments might come out so PLEASE HELP and let me know what might be tested. For all I know, only titration seems like a possibility. THIS IS URGENT PLEASE PLEASE PLEASE AND THANKS SO MUCH!!!
Heyy, I was looking through your site and its really very good and informative, so thanks for that, however for sources of error, I have a feeling you don’t really know what they are. For the SPA examination we are supposed to state sources of experimental error that cannot be corrected, and not human error. Therefore the sources of error you wrote above (parallex, meniscus, washing etc), aren’t experimental errors. What you write can help us do well for carrying out the experiment so we dont make those mistakes and so we get the most accurate results, however they cannot answer the last question of the paper which asks for experimental errors. So I was wondering if you could re answer the question above? Thanks(:
Hi Sean,
what are the possible sources of error for a SPA topic on speed of reaction. Hope you can help me, thanks.
Fiona.