Why do many metal ions produce acidic solutions when dissolved in water?

Water molecules form a complex with metal ions (usually a 6-coordinate complex). And the high charge density on a metal ion draws electrons away from the water molecules, making the O-H bonds more polar than normal. This allows the dissociation of the protons, making solutions of most metal ions acidic

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adefioyelaoye adefioyelaoye · Answer 2 · 2021-10-28T11:31:29+02:00

Answer:

Water(H₂O) is a compound which reacts with metal ions such as Calcium or Magnesium ions(Ca²⁺ or Mg²⁺) to form a complex.

The complex formed are usually in a 6-coordinate form and the metal ions normally have a high charge density which helps to attract electrons from the water molecules.

When the electrons are drawn from the water molecules , the O-H bond become polar ( having positive and negative charge).

The increase in polarity encourages the breakdown of the protons which in turn makes the solutions of most metal ions to be acidic.

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