Product details

Titration of a polyvalent acid with a strong base with Cobra4

Titration of a polyvalent acid with a strong base with Cobra4

Item no.: P3121260
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Experiment Type: Teacher Experiment, Laboratory Experiment

Difficulty Expenditure of Time print
  • Description
  • Scope of Supply
  • Accessories
  • Downloads and Documents


Phosphoric acid and sodium hydroxide are to be used to give an example of a titration of a polyvalent acid with a strong base.


  • Drop counter optimizes the experimental procedure
  • Simplified implementation: all pre-settings already prepared
  • Extensive automation of the experiment allows concentration on the learning objectives


  1. Measure the alteration of the pH value during a titration of an aqueous solution of phosphoric acid with a 0.1 molar sodium hydroxide solution at constant temperature using the Cobra4 system.
  2. From the titration curve read the equivalence points and pKa values.
  3. Determine the concentration of the acid.

What you can learn about

  • Phosphoric acid
  • Sodium hydroxide
  • Polyvalent acid
  • pKa values
  • Proteolysis
  • pH value

Necessary accessories

  • Precision balance 620g/0.001g


Document     Filesize
p3121260e.pdf Experiment guide, English 554.48 KB

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