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Lecture 21 – Cations, Anions and Hydrolysis in Water

5 Factors Affecting pKa– lower values of pKa and pH correspond to greater extent of hydrolysis and higher acidity of the solution. Cation Radius, pm pKa K+ 152 14.5 Na+ 116 14.2 Li+ 90 13.6 (too small to measure directly) Ba2+ 149 13.5 Ca2+ 116 12.8 Mg2+ 86 11.4 Rate of hydrolysis of metal or acidity of a hydrated cationINCREASES with …

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