[cmquer]

what are the advantages of colorimetric method over the titration method when determine the phosphoric acid content in cola sample?

Also, despite that the diluting samples can fall within the applicable range, is there any other reason(s) for diluting sample in colorimetric analysis?

[Borek]

Weren't you told to read forum rules?

[food]

One big advantage is that the proportionality constant between the measured quantity and the weight of the analyte can be derived from known physical constants. I did a coulometric analysis once, and used Faraday's constant to determine how many electrons were basically flowing - thereby using some stoichiometry and determing concentration of the unknown. So basically, no standardization or calibration is required. Also Coulometric methods are faster and more convenient than volumetric or gravimetric procedures and they are readily adapted to automation.

don't copy my stuff word for word - or I will find and destroy you. and your lab.