CBSE Class 11-science Answered
Ionisation of water leads to formation of H3O+ and OH- ions, but ph scale considers H+ ions concentration , so how is it related?? What is pOH? Please explain..
Asked by dasputemanoj81 | 06 Sep, 2017, 08:37: PM
Expert Answer
According to both Arrhenius and Brønsted‐Lowry theories of acids and bases, an acid is a hydrogen ion (proton that is H+) donor.
But such acid is able to show its acidic nature only in presence of water that is aqueous medium because H+ ions are very unstable.
Ionisation of water molecules also produce H+ and OH- ions.
These H+ get combined immediately with water molecules to form H3O+ ions.
The amount of H3O+ produced is equal to H+ ions present in the solution.
Thus, H3O+ ions are like carrier of H+ ions.
pH scale is to show acidity, hence it considers H+ ions which are equivalent to H3O+ ions present in that solution.
pOH represents concentration of hydroxyl ions (OH−).
The formulae related to pH and pOH are as follows:
pOH = −log10(OH−)
pH = −log10(H+)
pH + pOH = 14
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