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Analysis of triprotic phosphoric acid by titration

Analysis of triprotic phosphoric acid by titration

VC1.7.2.2

Titration curve of the triprotic acid phosphoric acid

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Description

Phosphoric acid is a triprotic acid. When dissolved in water, it first gives up one proton and dissociates to dihydrogen phosphate, i.e. it reacts like a monoprotic acid (see formula 1). The addition of sodium hydroxide, e.g. during titration, first leads to complete dissociation of the phosphoric acid into dihydrogen phosphate.

The second protolysis, i.e. the reaction to hydrogen phosphate (see formula 2), occurs only after a high pH value has been reached, approx. pH 9. The third protolysis requires a considerably higher pH value (see formula 3). In experiment C1.7.2.2, the first two protolysis steps of phosphoric acid are determined in an automatic titration.

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
2	664103 4	Beaker, DURAN, 250 ml, squat
1	665997 4	Graduated pipette 10 ml
1	666003 4	Pipetting ball (Peleus ball)
1	665847 4	Burette side stopcock, 50 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	30043 8	Stand rod, 75 cm, 12 mm diam.
1	30011 4	Saddle base
1	30126 4	Stand rod 25 cm, 10 mm Ø
2	30109 4	Bosshead S
2	666555 4	Universal clamp 0...80 mm
1	6610821	Stopcock grease
1	6743440 4	Phosphoric acid, 10 %, 100 ml Warning H315 H319
1	6738421 4	Sodium hydroxide solution, 1 mol/l, 1 l Danger H314 H290
1	6744640 4	Buffer solution pH 4.00, 250 ml
1	6744670 4	Buffer solution pH 7.00, 250 ml
1	6751600 4	* Thymolphthalein solution, 0.1 %, 50 ml Warning H226 H319
1		additionally required: PC with Windows XP/Vista/7/8/10 (x86 or x64)

Articles marked with * are not essential, we do however recommend them to carry out the experiment.

Experiment Instructions

PDF (Experiment description)

C1.7.2.2 Analysis of triprotic phosphoric acid by titration

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Analysis of triprotic phosphoric acid by titration

Description

Components of equipment sets

Experiment Instructions

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