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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.
NH3 + H2O NH4+ + OH-. This is a shorthand way of saying that one molecule of ammonia reacts with one molecule of water to form one ammonium ion and a hydroxyl ion. From the doubled headed arrow, we can tell that the reaction can go either way and hydroxyl ions and ammonium ions could combine to form ammonia and water.