Which metal hydroxides are soluble

Colours of precipitates are noted with respective compound. Colours of these 3d metal hydroxides can be used to identify the 3d metals or ions. Some metal hydroxides are amphoteric compounds. These hydroxides are not dissloved in water. But adding excess NaOH aq to these precipitates, they dissolve in the water. Colours of amphoteric metal hydroxides are noted with the compound.

Ferrous hydroxide Fe OH 2 and ferric hydroxide Fe OH 3 are insoluble in water and form green colour and brown colour precipitates in water. These precipitates do not dissolve in excess aqueous NaOH. Ammonium hydroxide is very well soluble in water. But its dissociation in water is partial incompleteness. Magnesium hydroxide is not soluble when aqueous NaOH is added. Therefore Mg OH 2 cannot be an amphoteric metal hydroxide. You know, zinc hydroxide is an amphoteric hydroxide.

But, magnesium hydroxide is not a amphoteric hydroxide. Calculate the pH of a 0. Give the value in M. What are amphoteric metal hydroxides? We assume the temperature to be K, which is too low. The result is correct, but meaningless.

Answer 4. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Which metal hydroxides are soluble? Ask Question. Asked 6 years, 1 month ago. Active 4 years, 8 months ago. Viewed 2k times. Later, I did search for information on the compound with the keywords ""Europium II hydroxide" soluble" , and I found some results: europium II sulfate is scarcely soluble in water, while europium II hydroxide dissolves readily and gives an alkaline reaction Concise Encyclopedia Chemistry, page Is there any other research on the compound Europium II hydroxide?

Is it really soluble? Improve this question. Jan Add a comment.