Question

What do you understand by an alkali?

Give two examples of :

(a) strong alkalis, (b) weak alkalis.

Answer 1

A compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda.

Alkali salts are soluble hydroxides ofalkali metals and alkaline earth metals,
An alkali is a substance with a pH value of more than 7

(a)sodium hydroxide (NaOH)
potassium hydroxide(KOH)
and calcium hydroxide(CaOH)


(b)
Aluminium hydroxide (Al(OH)3)
Ammonium hydroxide(NH4OH)