RT other
T1 Determination of bicarbonate in fresh and drinking waters by potentiometry. A simulated lab experiment.
A1 Milla González, Miguel
A2 Química Analítica
K1 quantitative analysis
K1 electrochemical methods
K1 potentiometry
K1 pH glass electrode
K1 bicarbonate
K1 hydrogen carbonate
K1 water analysis
K1 determination of bicarbonate in water
K1 determination of hydrogen carbonate in water
K1 titration curve
K1 titration curve using a spreadsheet
K1 simulated lab experiment
K1 stoichiometric calculations
AB In this exercise, the concentration of bicarbonate (hydrogen carbonate) in a sample of  fresh (or drinking) water is determined by potentiometry. The aliquot for analysis is 50 milliliters and the titrant concentration ( HCl ) is determined by the amount of bicarbonate in the sample. In this simulated titration, this amount is  in the range of 20-300 milligrams per liter . A preliminary evaluation with colorimetric indicator ( methyl orange ) allows to quickly find the equivalence point in milliliters. The purpose of this operation is to make the potentiometric titration faster allowing the change in the parameters of the analysis ( sample aliquot or concentration of HCl) if necessary. With the obtained data, the potentiometric titration curve is drawn using a spreadsheet and the equivalence point is obtained from the graph of the first derivative. The analysis is performed in quintuplicate and the result is given as the mean value of the determinations. The data are randomly generated .  The laboratory experiment ends with two self-evaluation exercises.
YR 2014
FD 2014-04-03T00:00:00Z
LK http://hdl.handle.net/10498/16029
UL http://hdl.handle.net/10498/16029
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 13-nov-2026