The ion product of water

VC1.3.3.2

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Description

The conductivity of pure water is not zero, although there are no charged ions solved. This contradiction can be explained with the autoprotolysis of water. Two molecules of water react in an equilibrium reaction to a hydroxide and an hydronium ion. These charged particles lead to a measureable conductivity.

The ion product of water describes this equilibrium reation. The pH scale is based on it. In this experiment, the ion product of water is determined by setting up a galvanic element and using the Nernst equation.

Components of equipment sets

1	6644071 8	Electrochemistry demonstration unit, CPS
1	666425 4	Panel frame C50, two-level, for CPS
1	666472 4	Table for electrochemistry, CPS
1	664401 4	Electrochemistry accessories set
1	665754 4	Measuring cylinder 100 ml, with plastic base
1	602023 4	Beaker, Boro 3.3, 150 ml, squat
1	6753400 4	Water, pure, 1 l
1	6738410 4	Sodium hydroxide solution, 0.1 mol/l, 500ml Warning H290
1	6746900 4	Hydrochloric acid, 1 mol/l, 500 ml Warning H290

Experiment Instructions

PDF (Experiment description)

C1.3.3.2 The ion product of water

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The ion product of water

Description

Components of equipment sets

Experiment Instructions

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