Question

What is the difference between base qnd alkali

Answer 1

Any substance that produces OH- (hydroxide ions) in aqueous solution is called alkali.

Here are some examples:

1) Sodium hydroxide solution - NaOH(aq).

2) Calcium hydroxide solution - Ca(OH)2(aq)

3) Ammonia solution - NH3(aq).

Any substance that will neutralize an acid,
but does not dissolve in water, is called a base.

Here are some examples:

Copper oxide, ferrous oxide and zinc carbonate are the good examples of base.

No doubt alkali as well as base neutralize acid, but we have observed that alkali produce OH− ions in the water , whereas bases such as copper oxide and ferrous do not produce OH- ions.
bases are metallic oxides.