Colorimetry Essay

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Colorimetry

Colorimetry is the analysis of chemical samples to gather information about their concentration. Colourimetry involves passing light through a sample and measuring how much is absorbed by the solution. Ref -http://www.wisegeek.com/what-is-colorimetry.htm

Most test substances in water are colourless and undetectable to the eye. Therefore to test for their presence I must be able to see them. To avoid sources of error, a colorimeter or spectrophotometer is normally used in colourimetry as both instruments can be used measure the amount of coloured light absorbed by a coloured sample in reference to a colourless sample.-

A colorimetre is an instrument that distinguishes colour samples to provide a measure of the colour’s description. It allows the absorbance of a solution at a certain colour of visual light to be determined. Colorimeters measure change as they determine the concentration of unknown solutions as they are relative to the absorbance.

A colorimetre device operates on Beer-Lambert's law. This law states that the absorption of light transmitted through a medium is directly proportional to the concentration of the medium.

Ref- http://www.wisegeek.org/what-is-a-colorimeter.htm#

A spectrophotometer is a photometer which is a device used for measuring light intensity that can measure intensity as a function of the colour or the wavelength of light. There are a range of different types of spect...

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...nly changed 1 variable which was the unknown solution.

My risk assessment was as detailed as needed to be as I wrote about all the different procedures when using Iron (III) Sulfate, the nature of the hazards, the control measure and what I done to dispose left over Iron (III) Sulfate.

I could modify my experiment to improve it by repeating the experiment 3 times to ensure that I got the most accurate and precise results as I could. I additionally could have compared each of my results to other members within the class as by doing this; it would give me an indication to see if my results were similar. Lastly, another way I could modify my experiment to improve it was to test more concentrations to see if the general trend continues over all of them and by doing this, I could have gotten more precise results from each concentrations transmission and absorbance.