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Small highly charged metal cations can produce acidic solutions. These cations are basically those with a charge of 3+ for example. These small cations can exert the greatest pull on the electrons in surrounding H20 molecules, resulting in a greater number of hydrogen ions to be lost from the water molecules, producing a more acidic solution. The larger Group 1 and 2 cations are too large and have too low of a charge and thus does not have any effect on pulling electrons from the surrounding H20 molecules and will not cause the H20 molecules to release their H protons to form acidic solution.
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