Question

Potassium hydroxide is classified as an Arrhenius base because KOH contains(1) OH- ions (2) O2- ions (3) K+ ions (4) H+ ions

Answer 1

Answer : The correct option is, (1) $OH^-$ ions.

Explanation :

According to the Arrhenius concept, an acid is a type of substance which ionizes in water to gives $H^+$ ions (hydronium ions or hydrogen ions) and a base is a type of substance which ionizes in water to gives $OH^-$ ions (hydroxide ions).

As we know that KOH is a base which ionizes in water to gives $OH^-$ ions (hydroxide ions) and $K^+$ ions.

Hence, potassium hydroxide is classified as an Arrhenius base because KOH contains $OH^-$ ions.

Answer 2

The answer is (1)OH- ions. The base has more OH- ions while the acid has more H+ ions. And if you dissolve them into water, the pH of the solution is also different. Base has pH>7 and acid has pH<7 at room temperature.