Question

Which of the following is an example of an Arrhenius base?

A. CaCO3
B. KOH
C. NH3
D. HCl

Answer 1

An Arrhenius base adds ions into water when added to the water hence it increases the concentration of ions in aqueous solution. Therefore, KOH is an example because the ions added to the water are called OH-ions.

Answer 2

Answer: B.
`KOH`

Explanation:

According to the Arrhenius concept, an acid is a substance that ionizes in the water to give hydronium ion or hydrogen ion
`(H^+)` and a bases is a substance that ionizes in the water to give hydroxide ion
`(OH^-)`.

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

According to the Lewis concept, an acid is defined as a substance that accepts electron pairs and base is defined as a substance which donates electron pairs.

`KOH\rightarrow K^++OH^-`: is a Arrhenius base.

`NH_3+H^+\rightarrow NH_4^+` : is a lewis base as it donates the lone pair of electrons.

`HCl\rightarrow H^++Cl^-` is a Arrhenius acid and bronsted lowry acid.