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Determination of water in ascorbic acid by the proton isoconcentration technique using the standard addition method
M R Karim1, T M Karadaghi, S O Ismail
1Chemistry Department, College of Science, Salahaddin University, Arbil, Iraq.
Abstract:
Water has been extracted from ascorbic acid into a dry mixture of equal volumes of methanol-organic solvents (n-propanol, ethylene glycol or propylene carbonate) and was determined potentiometrically, using the calibration graph based on the large and systematic change in cell potential for addition of 0-1%, m/m water into a dry mixture of the above mentioned mixture containing 2 x 10(-3) M trifluoromethanesulphonic acid (TFMSA) using a combination pH glass electrode with silver-silver chloride reference electrode having tetraethylammonium chloride (TEACl) in methanol as a filling electrolyte. The method is fast, accurate, reproducible and simple for operation.