Consider the following reactions (i) CO3^2-+H2 O ⇌HCO3^-+OH^- (ii) CO2+H2 O ⇌H2 CO3 (iii) NH3+H2

Name: Problem 54, Chapter 7: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-02-21T20:18:41-08:00
Duration: 3 min 8 s
Channel: Rashmi Gondi
Description: Consider the following reactions (i) CO3^2-+H2 O ⇌HCO3^-+OH^- (ii) CO2+H2 O ⇌H2 CO3 (iii) NH3+H2 O ⇌NH4 OH (iv) HCl+H2 O ⇌H3 O^++Cl^- Which pair of reactions proves that water is amphoteric? (1) i and ii (2) ii and iii (3) iii and iv (4) i and iii

step 1 Let us try to answer problem number 54 from chapter 7. Now let me tell you that the correct opti

Question

Consider the following reactions (i) $\mathrm{CO}_{3}^{2-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{HCO}_{3}^{-}+\mathrm{OH}^{-}$ (ii) $\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{2} \mathrm{CO}_{3}$ (iii) $\mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{NH}_{4} \mathrm{OH}$ (iv) $\mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{Cl}^{-}$ Which pair of reactions proves that water is amphoteric? (1) $i$ and ii (2) ii and iii (3) iii and iv (4) i and iii

   Consider the following reactions
(i) $\mathrm{CO}_{3}^{2-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{HCO}_{3}^{-}+\mathrm{OH}^{-}$
(ii) $\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{2} \mathrm{CO}_{3}$
(iii) $\mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{NH}_{4} \mathrm{OH}$
(iv) $\mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{Cl}^{-}$
Which pair of reactions proves that water is amphoteric?
(1) $i$ and ii
(2) ii and iii
(3) iii and iv
(4) i and iii

Objective Chemistry for Engineering and Medical Entrance Examinations

K Rama Rao 1st Edition

Chapter 7, Problem 54

Instant Answer

Solved by Expert Rashmi Gondi

02/21/2022

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An amphoteric substance is one that can act as both an acid and a base. In other words, it can donate a proton (H+) and accept a proton. Show more…

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Consider the following reactions (i) $\mathrm{CO}_{3}^{2-}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{HCO}_{3}^{-}+\mathrm{OH}^{-}$ (ii) $\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{2} \mathrm{CO}_{3}$ (iii) $\mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{NH}_{4} \mathrm{OH}$ (iv) $\mathrm{HCl}+\mathrm{H}_{2} \mathrm{O} \rightleftharpoons \mathrm{H}_{3} \mathrm{O}^{+}+\mathrm{Cl}^{-}$ Which pair of reactions proves that water is amphoteric? (1) $i$ and ii (2) ii and iii (3) iii and iv (4) i and iii

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Key Concepts

Brønsted-Lowry Acid-Base Theory

This theory defines acids as proton (H+) donors and bases as proton acceptors. It provides the framework for understanding how water can act as either an acid or a base depending on the reaction context.

Amphoteric Nature

An amphoteric substance is one that can act as either an acid or a base. Water is a prime example of an amphoteric substance because it can donate a proton to a base, as seen in its reaction with ammonia, or accept a proton from an acid, as seen in its reaction with hydrochloric acid.

Acid-Base Reaction Analysis

By analyzing reactions where water donates a proton (acting as an acid) and where it accepts a proton (acting as a base), one can demonstrate its amphoteric character. The pairing of reactions where one involves water reacting with a strong base and another where it reacts with a strong acid clearly illustrates this dual behavior.

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