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Analysis of triprotic phosphoric acid by titration

VC1.7.2.2
Analysis of triprotic phosphoric acid by titration
Analysis of triprotic phosphoric acid by titration Titration curve of the triprotic acid phosphoric acid
Analysis of triprotic phosphoric acid by titration

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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 LD
1 524220  4  CASSY Lab 2 LD
1 5240672  4  pH adapter S LD
1 6674172  4  pH sensor with plastic shaft, BNC LD
1 524074  4  Timer S LD
1 3374681 Drop counter LD
1 607105  8  Magnetic stirrer mini 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 665847  4  Burette side stopcock, 50 ml LD
1 665816  4  Burette filling funnel plastic, 35 mm Ø LD
1 666559  8  Burette clamp for 1 burette, roller clamp LD
1 30002  4  Stand base, V-shaped, small LD
1 30043  8  Stand rod, 75 cm, 12 mm diam. LD
1 30011  4  Saddle base LD
1 30126  4  Stand rod 25 cm, 10 mm Ø LD
2 30109  4  Bosshead S LD
2 666555  4  Universal clamp 0...80 mm LD
1 6610821 Stopcock grease LD
1 6743440  4  Phosphoric acid, 10 %, 100 ml LD
GHS07 Warning H315 H319
1 6738421  4  Sodium hydroxide solution, 1 mol/l, 1 l 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 6751600  4  * Thymolphthalein solution, 0.1 %, 50 ml LD
GHS02GHS07 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) PDF (Experiment description) C1.7.2.2 Analysis of triprotic phosphoric acid by titration
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