The extent of protonation and deprotonation

The extent of deprotonation of a weak acid in solution depends on the acidity constant and the initial concentration of the acid, its concentration as prepared. The fraction deprotonated, the fraction of acid molecules HA that have donated 

The extent to which a weak base B is protonated is reported in terms of the fraction protonated  

The calculation of either/proceeds in the same way as for the calculation of the pH of a solution, the only difference being how the calculated value of x in the equilibrium table is used. 

The fraction of acetic acid molecules deprotonated in the solution referred to in Example 4.5a is 

That is, 1.1 per cent of CH3COOH molecules have lost their acidic proton. 

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