Question

Which are strong bases? Check all that apply.

- HCl

- NaOH

- NH3

- H3CO3

- HNO3

- KOH

Answer 1

We are to identify which of the following chemical compounds are considered strong bases. To answer this, let us define first what is a strong base chemical compound. Well, it is a compound which completely dissociates in the water. Hence, the answers are the following:
1. NaOH - Sodium Hydroxide
2. KOH - Potassium Hydroxide

Answer 2

Answer:

            NaOH and KOH

Explanation:

                   Acid and Bases are defined according to three different theories and concepts.

                      a) Arrhenius Concept

                       b) Lowry Bronsted Theory

                      c) Lewis Theory

According to Arrhenius Concept of Acid and Base, "Acid is any specie which when dissolved in water ionizes to produce H⁺ ions".

Example:

                                  H₂SO₄    →    2 H⁺  +  SO₄²⁻

                                  H₂SO₄    →    2 H⁺  +  SO₄²⁻

While, "Bases are those species which when dissolved in water produces Hydroxyl Ions (OH⁻)".

Example:

                                  NaOH    →  Na⁺  +  OH⁻

                                  KOH    →     K⁺  +  2 OH⁻

Also,

          Strong acids and strong bases are catogorized as those species which when dissolved in water completely dissociates into corresponding ions. Hence, NaOH and KOH completely dissociates in water.