NCERT Class 11 Chemistry Lab Manual ph and ph change in Aqueous Solutions

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                                                         PH AND PH CHANGE IN AQUEOUS SOLUTIONS

You have already performed experiments on dynamic equilibrium between unionised salt and the ions produced by it on dissolving in a solvent. In this unit we will learn about shift in ionic equilibrium between unionised water molecules and H+ and OH– ions. The conductivity experiments prove that even pure water ionises to some extent although it has very low conductivity. On this basis it can be concluded that ionic equilibrium exists in pure water also. This ionic equilibrium can be represented as

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