Question

Precipitation of cobalt(II) hydroxide from aqueous solution

Answer 1

Answer:

When an alkali metal hydroxide is added to an aqueous solution of cobalt (II) salt, Cobalt(II) hydroxide precipitates as a solid

Explanation:

When an alkali metal hydroxide is added to an aqueous solution of cobalt (II) salt, Cobalt(II) hydroxide precipitates as a solid . For example, 2 NaOH +Co²⁺  →2Na + Co(OH)₂  

From the water ligands Hydrogen ion attached to the cobalt ion is removed by the hydroxide ions.

From  two of the water molecules , a hydrogen ion has been removed , then the resultant is a complex with no charge i.e. a neutral complex.  

One of the important property of cobalt (II) hydroxide are it is slightly soluble in water and it is insoluble in alkalis.