Asides from the fact that alimininium sulphate is made of a strong acid, why is it .. Watch

ECullen
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Acidic??
Like in terms of an explanation based on aluminium & sulphate ions??
THanks

Exam in morn
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Zygroth
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(Original post by ECullen)
Acidic??
Like in terms of an explanation based on aluminium & sulphate ions??
THanks

Exam in morn
Just because it's made from a strong acid doesn't make it acidic :p:
In water, aluminium sulfate reacts to give aluminium hydroxide and sulfuric acid. The hydroxide is insoluble and precipitates out, leaving sulfuric acid in solution.

Good luck in the exam
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charco
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(Original post by Zygroth)
Just because it's made from a strong acid doesn't make it acidic :p:
In water, aluminium sulfate reacts to give aluminium hydroxide and sulfuric acid. The hydroxide is insoluble and precipitates out, leaving sulfuric acid in solution.

Good luck in the exam
This answer is wrong.

Aluminium salt solutions are acidic due to the high charge density of the 3+ ion in the same way as iron (III) salts

Aluminium ions in solution exist as hexaaqualuminium ions. The high charge density of the Al3+ ion polarises the attached water molecules and allows release of hydrogen ions:

[Al(H2O)6]3+ --> [Al(H2O)5OH]2+ + H+

The released hydrogen ions make aluminium aqueous salts acidic...
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Zygroth
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(Original post by charco)
This answer is wrong.

Aluminium salt solutions are acidic due to the high charge density of the 3+ ion in the same way as iron (III) salts

Aluminium ions in solution exist as hexaaqualuminium ions. The high charge density of the Al3+ ion polarises the attached water molecules and allows release of hydrogen ions:

[Al(H2O)6]3+ --> [Al(H2O)5OH]2+ + H+

The released hydrogen ions make aluminium aqueous salts acidic...
Yeah, go with this :p: Sorry about that
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