Question

Name a base which is not an alkali.

Answer 1

Hint: We know that base is a substance, which could neutralize acid. When an acid and base react together, the product formed will be salt and water. We can classify base into two types: Strong base and weak base. Bases that are water-soluble are called alkali. Both alkali and bases are made up of metal oxides, metal hydroxides, metal carbonates.

Complete step by step answer:
Let us define a base.
A base is a substance, which neutralizes an acid. Base has the ability to accept a proton from an acid. Some of the bases such as metal hydroxides and metal oxide form neutral products on reaction with acids. Base is insoluble in water. Salts and water are produced when the base reacts with acids. They have bitter taste and are slippery. There are two types of bases: strong and weak bases.
Sodium hydroxide is an example of a strong base.
Ammonia is an example of a weak base.
Let us define an alkali.
An alkali is a base that is water-soluble. All alkalis are base but not all bases are alkalis. A basic salt of alkali earth metal or alkali metal is an alkali.
When we add alkali to acid, there is an increase in pH of the solution, whereas when an acid is added to alkali, the pH of the solution decreases because of the removal of base.
Some bases such as sodium hydroxide, potassium hydroxide are also called as alkali because these bases are soluble in water.
Whereas bases such as copper hydroxide, zinc hydroxide, silver hydroxide are not alkali because we know that these bases are insoluble in water. Hence, they cannot be called alkali.
The name of a base that is not alkali is copper oxide because the base, copper oxide reacts with acid to neutralize them but it is not water-soluble.

Note:
We know that alkalis are bases (or) hydroxide that belongs to the s-block element that is alkali metal and alkali earth metal. Alkali has the ability to accept a proton, and gives out hydroxide ion $\left( {{\text{O}}{{\text{H}}^{\text{ - }}}} \right)$. Some of the applications of alkali are,
Sodium hydroxide is used in the manufacture of paper, detergents and soaps.
Potassium hydroxide is used to make soil acid more alkaline, so that the growth of plants are stronger.
Potassium hydroxide is used as electrolyte in nickel-cadmium batteries.
Alkalis are used in cleaning ovens, baking soda and as drain unblockers.