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Adding hydroxide ions to 2+ hexaaqua ions These have the form [M(H2O)6]2+. Their acidity is shown in the reaction of the hexaaqua ions with water molecules from the solution: They are acting as acids by donating hydrogen ions to water molecules in the solution.eaction of hydroxide ions with the hexaaqua ion Statistically, there is far more chance of a hydroxide ion hitting a hexaaqua metal ion than of hitting a hydrogen ion. There are far more hexaaqua ions present.
The same thing happens on a less dangerous scale when you add baking soda to water. During the dissociation, OH-ions and carbonic acid are released in the solution. The number of OH-ions is greater than the number of H 3 O + ions (H + and H 2 O), and the pH increases. It's just not as strong a difference as in sodium hydroxide.