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Determination of acid concentration by titration with drop counter

Determination of acid concentration by titration with drop counter

VC3.5.1.1

Titration curve of vinegar

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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 8	Sensor-CASSY 2
1	524220 4	CASSY Lab 2
1	5240672 4	pH adapter S
1	6674172 4	pH sensor with plastic shaft, BNC
1	524074 4	Timer S
1	3374681	Drop counter
1	607105 8	Magnetic stirrer mini
1	604592 4	Stirring magnet, PTFE, oval, l = 40 mm, 20 mm diam.
2	664103 4	Beaker, DURAN, 250 ml, squat
1	665997 4	Graduated pipette 10 ml
1	666003 4	Pipetting ball (Peleus ball)
1	665845 4	Burette side stopcock, 25 ml
1	665816 4	Burette filling funnel plastic, 35 mm Ø
1	666559 8	Burette clamp for 1 burette, roller clamp
1	30002 4	Stand base, V-shaped, small
1	30042 4	Stand rod, 47 cm, 12 mm diam.
1	30011 4	Saddle base
1	30041 4	Stand rod, 25 cm, 12 mm Ø
2	666543 4	Double, crossed boss head, 0...16 mm
1	666555 4	Universal clamp 0...80 mm
1	6738420 4	Sodium hydroxide solution, 1 mol/l, 500 ml Danger H314 H290
1	6744640 4	Buffer solution pH 4.00, 250 ml
1	6744670 4	Buffer solution pH 7.00, 250 ml
1		additionally required: balsamic vinegar or other dark coloured vinegar
1		additionally required: PC with Windows XP/Vista/7/8/10 (x86 or x64)

Experiment Instructions

PDF (Experiment description)

C3.5.1.1 Determination of acid concentration by titration with drop counter

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Determination of acid concentration by titration with drop counter

Description

Components of equipment sets

Experiment Instructions

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