Give examples of three substances that form aluminum cations Al3 + in solution.

Substances that form ions when melted or dissolved in water are called electrolytes.

To solve this problem, you need to use the solubility table. Those substances that are soluble and are electrolytes, which means they decompose into ions. Let’s find three soluble aluminum salts – these are chloride, sulfate and nitrate. Let us write the equations for their dissociation (decay into ions upon dissolution):

AlCl3 = Al (3+) + 3 Cl (-);
Al2 (SO4) 3 = 2Al (3+) + 3 SO4 (2-);
Al (NO3) 3 = Al (3+) + 3NO3 (-).