Determination of the content of phosphoric acid in a cola drink

VC3.6.4.2
Determination of the content of phosphoric acid in a cola drink
Determination of the content of phosphoric acid in a cola drink Titration of a cola drink
Determination of the content of phosphoric acid in a cola drink

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Description

Phosphoric acid is added to cola in order to heighten the sensation of thirst, as a preservative, and to cover up the sugary taste. In experiment C3.6.4.2, phosphoric acid is titrated with sodium hydroxide. When titrating cola, the first two buffer stages are also clearly recognisable, just as in the titration of phosphoric acid. (It is generally impossible to titrate the third stage in these diluted solutions.) The second stage becomes indistinct in the presence of other ingredients. The phosphoric acid content of the cola beverage can be determined with the first stage.

Components of equipment sets

1 524005W  4  Mobile-CASSY 2 WiFi LD
1 524220  4  CASSY Lab 2 LD
1 5240672  8  pH adapter S LD
1 529672  4  pH sensor, BNC LD
2 664131  4  Beaker Boro 3.3, 400 ml, squat LD
1 664130  4  Beaker, Boro 3.3, 250 ml, squat LD
1 665845  4  Burette, clear glass, 25 ml LD
1 666559  4  Burette clamp for 1 burette, roller clamp LD
2 30109  4  Bosshead S LD
1 666555  4  Universal clamp 0...80 mm LD
1 607105  4  Magnetic stirrer mini LD
1 30002  8  Stand base, V-shaped, small LD
1 30011  8  Saddle base LD
1 30126  8  Stand rod 25 cm, 10 mm Ø LD
1 30127  8  Stand rod 50 cm, 10 mm Ø LD
1 661243  4  Wash bottle PE 500 ml LD
1 6738410  4  Sodium hydroxide solution, 0.1 mol/l, 500ml LD
GHS05 Warning 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:
Cola beverage
1 additionally required: PC with Windows 7 or higher with WIFI or USB connection

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) C3.6.4.2 Determination of the content of phosphoric acid in a cola drink
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