I had a question as to what happens when aluminum sulfate is placed into water. After conducting research online, I got varied answers: some say that it dissociates into Al$^{3+}$ and SO$_4$$^{2-}$ ions, while others claim that aluminum sulfate will react with water to form aluminum hydroxide and sulfuric acid.
I even conducted a mini-lab by placing aluminum sulfate in water and sometimes there was precipitate (assumed to be aluminum hydroxide) and sometimes there was none.
What is really happening?
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