When aluminium chloride is dissolved in water,the resulting solution has a pH of 3. Explain. (3marks)
Answers
Explanation:
Al3+ is a small ion with high charge, therefore it has very high charge density and high polarizing power. It will grab OH- from water, resulting in more H+ in the solution.
Al3+ and H2O <=> [Al(OH)]2+ and H+
The H+ results in the acidic solution. This phenomenon is also observed in solutions of Fe3+ and Cr3+ salts for exactly the same reason.
Note that the reaction can go further.
[Al(OH)]2+ and H2O <=> [Al(OH)2]+ and H+
[Al(OH)2]+ and H2O <=> Al(OH)3 and H+
Al(OH)3 and H2O <=> [Al(OH)4]- and H+
So you will end up with a solution of vaious Al-OH complexes (mainly [Al(OH)4]-, due to the presence of excess H2O) and a lot of H+
Answer:
Aluminium chloride is a powerful acid. So when added to water, it reacts and show it's acidic nature.
Therefore, it resulted in a solution of pH 3.
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