Can Cu+2 dissolve in water? what does Cu2+ and Cu look like in appearance
The correct answer and explanation is:
Yes, Cu²⁺ can dissolve in water. When copper (II) ions (Cu²⁺) dissolve in water, they typically form an aqueous solution, often referred to as a copper(II) solution. The copper ion itself is hydrated, meaning water molecules surround the Cu²⁺ ion. The water molecules form a coordination complex with the copper ion, where the oxygen atoms of water are oriented towards the copper, resulting in a blue-colored solution. This color is one of the distinctive properties of copper(II) compounds in water.
In terms of appearance, Cu²⁺ ions themselves are not visible to the naked eye because they are part of an ionic solution. However, in an aqueous solution, they give rise to a characteristic blue color. The intensity of the blue color depends on the concentration of Cu²⁺ in the solution.
On the other hand, copper (Cu), in its elemental form, has a reddish-brown metallic appearance. Copper metal is solid at room temperature and has a shiny, reddish color when freshly cut or polished. It is a good conductor of electricity and heat and is widely used in electrical wiring and plumbing due to these properties. Over time, copper can develop a greenish patina when exposed to air and moisture, due to the formation of copper carbonate (CuCO₃) on its surface. This is common in copper roofs or outdoor copper statues.
In summary, Cu²⁺ ions dissolve in water and form a blue solution, while Cu metal appears reddish-brown and may oxidize to form a green patina. The distinct characteristics of both the metal and the ion help in identifying copper compounds in different forms.