Question

classify each substance as a strong acid , weak acid , strong base or weak base

KOH, Ca(OH)2, H 2SO4, HI, HCOOH, NaOH, HCN, C5H5N

Answer 1

Acid: The compound which gives H+ ion in aqeous solution is called as an acid.

Strong acid: The acid which is completly ionized is called as strong acid.

Weak acid: The acid which is partially ionized is called as weak acid.

Base: The compound which gives OH- ion aqueous solution is called as base.

Strong base: The base which is completly ionized is called as strong base.

weak base: The base which is partially ionized is called as weak base.

The compound which can donate lone pair of electrons is also called as base. (Lewis base)

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KOH : It gives OH- ion in aquous solution. so it is a base and completly ionize so strong base.

Ca(OH)2: It gives OH- ion in aquous solution. so it is a base and completly ionize so strong base.

H2SO4 : It gives H+ ion in aquous solution. so it is an acid and completly ionize so strong acid.

HI: It gives H+ ion in aquous solution. so it is an acid and completly ionize so strong acid.

HCOOH : It gives H+ ion in aquous solution. so it is an acid and partially ionize so weak acid.

NaOH :  It gives OH- ion in aquous solution. so it is a base and completly ionize so strong base.

HCN: It gives H+ ion in aquous solution. so it is an acid and partially ionize so weak acid.

C5H5N:  it can donate lone pair of electrons ( present on nitrogen) so it is a base and weak base.