Question

For The Reaction CH3COOH ---> CH3COO- + H+, which of the following statements is true? A.) Ch3COOH is a Bronsted Lowry base. B.) CH3COO- is a Bronsted Lowry base. C.) Ch3COO- is a conjugate base. D.) CH3COO- is an Arrhenius base.

Answer 1

Answer: Option (C) is the correct answer.

Explanation:

According to Arrhenius, bases are the species which when dissolved in water will give hydroxide ions, that is, $OH^{-}$.

For example, $NaOH + H_{2}O \rightarrow Na^{+} + OH^{-}$

Arrhenius acids are the species which when dissolved in water will give hydrogen ions, that is, $H^{+}$.

For example, $CH_{3}COOH + H_{2}O \rightleftharpoons H_{3}O^{+} + CH_{3}COO^{-}$

In water, when an acid loses a hydrogen ion then the specie formed is known as conjugate base.

Here, $CH_{3}COO^{-}$ is the conjugate base of $CH_{3}COOH$.

Similarly, species which accept the hydrogen ion result in the formation of conjugate acid.

Hence, $H_{3}O^{+}$ is the conjugate acid of $H_{2}O$.

Thus, we can conclude that $CH_{3}COO^{-}$ is the conjugate base.

Answer 2

Answer : The correct option is, (B) $CH_3COO^-$ is a Bronsted Lowry base.

Explanation :

According to the Arrhenius theory, an acid is a substance that ionizes in the water to give hydronium ion $(H_3O^+)$ 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 concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

The given reaction is,

$CH_3COOH\rightleftharpoons CH_3COO^-+H^+$

In this reaction, acetic acid is a Bronsted Lowry-acid and $CH_3COO^-$ is a Bronsted Lowry-base.

Hence, the correct option is, (B) $CH_3COO^-$ is a Bronsted Lowry base.