What is the difference between a pure substance and a mixture? how are the atoms different?

Pure substances cannot be separated into any other kinds of matter while a mixture is a combination of two or more pure substances

A pure substance has constant physical and chemical properties while mixtures have varying physical and chemical properties

The atoms are different by prime difference lies in the fact that pure substances cannot by physically separated while mixtures can be (physical methods)

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l