Question

question
all of the options below are base ionization reactions except
select the correct answer below:
○ h₂o + nh₂⁻ ⇌ oh⁻ + nh₃.
○ cn⁻ + h₂o ⇌ oh⁻ + hcn.
○ h₂o + nh₃ ⇌ nh₄⁺ + oh⁻.
○ h₂o + hno₃ ⇌ h₃o⁺ + no₃⁻.

Explanation:

Step1: Recall base ionization reaction concept

A base ionization reaction involves a base (either a weak base like \(NH_3\), \(CN^-\), \(NH_2^-\) or a strong base) reacting with water to produce \(OH^-\) ions.

Step2: Analyze each reaction

• For \(H_2O+NH_2^-

ightleftharpoons OH^ - +NH_3\): \(NH_2^-\) (a base) reacts with water to give \(OH^-\), so it is a base ionization reaction.

• For \(CN^ - +H_2O

ightleftharpoons OH^ - +HCN\): \(CN^-\) (a base) reacts with water to give \(OH^-\), so it is a base ionization reaction.

• For \(H_2O+NH_3

ightleftharpoons NH_4^++OH^-\): \(NH_3\) (a base) reacts with water to give \(OH^-\), so it is a base ionization reaction.

• For \(H_2O+HNO_3

ightleftharpoons H_3O^++NO_3^-\): \(HNO_3\) (a strong acid) donates a proton (\(H^+\)) to water to form \(H_3O^+\). This is an acid ionization reaction (not a base ionization reaction as per the Brønsted - Lowry acid - base theory where an acid donates a proton).

Answer:

\(H_2O+HNO_3
ightleftharpoons H_3O^++NO_3^-\) (the reaction \(H_2O+HNO_3
ightleftharpoons H_3O^++NO_3^-\) is the one that is not a base ionization reaction)