Determination of acid concentration by titration with drop counter

VC3.5.1.1
Determination of acid concentration by titration with drop counter
Determination of acid concentration by titration with drop counter Titration curve of vinegar
Determination of acid concentration by titration with drop counter

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Description

In experiment C3.5.1.1, the acid concentration of balsamic vinegar is determined. Due to the dark colour, coloured indicators cannot be used here. Rather, the pH is measured continuously. This is done with a pH electrode. pH electrodes are potentiometric electrodes which respond ion-selectively only to changes in the potential of protons. The measured potential is then converted to a pH value. In the experiment, a complete titration curve of the titration of balsamic vinegar with sodium hydroxide is recorded using a drop counter.

Components of equipment sets

1 524013  4  Sensor-CASSY 2 LD
1 524220  4  CASSY Lab 2 LD
1 5240672  8  pH adapter S LD
1 6674172  4  pH sensor with plastic shaft, BNC LD
1 524074  4  Timer S LD
1 3374681  8  Drop counter LD
1 607105  4  Magnetic stirrer mini LD
1 604592  4  Stirring magnet, PTFE, oval, l = 40 mm, 20 mm diam. LD
2 664103  4  Beaker, DURAN, 250 ml, squat LD
1 665997  4  Graduated pipette 10 ml LD
1 666003  4  Pipetting ball (Peleus ball) LD
1 665845  4  Burette, clear glass, 25 ml LD
1 665816  4  Burette filling funnel plastic, 35 mm Ø LD
1 666559  4  Burette clamp for 1 burette, roller clamp LD
1 30002  8  Stand base, V-shaped, small LD
1 30042  8  Stand rod, 47 cm, 12 mm diam. LD
1 30011  8  Saddle base LD
1 30041  8  Stand rod, 25 cm, 12 mm Ø LD
2 666543  4  Double, crossed boss head, 0...16 mm LD
2 666555  4  Universal clamp 0...80 mm LD
1 6738420  4  Sodium hydroxide solution, 1 mol/l, 500 ml LD
GHS05 Danger H314 H290
1 6744640  4  Buffer solution pH 4.00, 250 ml LD
1 6744670  4  Buffer solution pH 7.00, 250 ml LD
1 additionally required:
balsamic vinegar or other dark coloured vinegar
1 additionally required: PC with Windows 7 or higher
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