Which of the following are arrhenius bases?
a) ch3oh
b) ch3cooh
c) hoh
d) h2nnh2

                  H₂O

Explanation:

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

Examples:

                                  HCl    →    H⁺  +  Cl⁻

                                  H₂SO₄    →    2 H⁺  +  SO₄²⁻

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

Examples:

                                  NaOH    →  Na⁺  +  OH⁻

                                  Mg(OH)₂    →     Mg²⁺  +  2 OH⁻

Given Options:

CH₃OH:

             Methanol when dissolved in water does not dissociate as follow,

                                    CH₃OH     →     H₃C⁺  +  OH⁻

Hence, it does not behave as Arrhenius Base.

CH₃COOH:

                  Acetic acid when dissolved in water produces H⁺ ions and Acetate ions i.e.

                                 CH₃COOH    →    CH₃COO⁻  +  H⁺

Therefore, it can act as Arrhenius Acid instead of Arrhenius Base.

H₂O:

        Water when dissolved in water dissociates as,

                                                  H₂O    →    H⁺  +  OH⁻

As it is producing both H⁺ and OH⁻ ions therefore, it can act as both Arrhenius Base and Arrhenius Acid.

H₂NNH₂:

              Hydrazine when dissolved in water can neither produce OH⁻ ions nor H⁺ ions hence, it is neither Arrhenius Base nor Arrhenius Acid,

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