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VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Chemistry => Topic started by: VCEMan94 on April 07, 2011, 05:24:16 pm

Title: Colourimetry Errors?
Post by: VCEMan94 on April 07, 2011, 05:24:16 pm

What are some errors that could account for an under and overestimation?

Title: Re: Colourimetry Errors?
Post by: Christiano on April 07, 2011, 08:41:57 pm

-The non-homogenous nature of the mixture - your sample may contain less concentration of phosphorus and there a lower % and vice versa.
-Some solution still stuck on the filter paper (if used) or stirring rod = lower %
-Some insoluble compounds may be in the solution, so the phosphorus as well as the insoluble compounds will absorb the light and give higher absorbancy = higher %