   Chapter 14, Problem 3RQ

Chapter
Section
Textbook Problem

# Define or illustrate the meaning of the following terms:a. amphotericb. Kw reactionc. Kw equilibrium constantd. pHe. pOHf. pKwGive the conditions for a neutral aqueous solution at 25°C, in terms of [H+], pH, and the relationship between [H+] and [OH−]. Do the same for an acidic solution and for a basic solution. As a solution becomes more acidic, what happens to pH, pOH, [H+], and [OH−]? As a solution becomes more basic, what happens to pH, pOH, [H+], and [OH−]?

(a)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw .are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: The definition of Amphoteric.

Explanation

The substance that can act both, as an acid and a base, according to the conditions of the reaction is known as amphoteric.

The word “Amphoteric” is derived from a Greek prefix “Amphi” which translates to “both”.

Therefore, any substance having the chemical properties of both the kinds (acid and base) is called amphoteric substances.

For example, water is a neutral compound but as per reaction conditions it acts as an amphoteric compound.

Water reacts with Hydrochloric acid as a base giving hydronium ion and chloride ion as products.

H2O+HClH3O+</

(b)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw. are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: The definition of Kw reaction.

(c)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw. are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: The definition of Kw equilibrium constant.

(d)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw .are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: The definition of pH.

(e)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw .are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: The definition of pOH.

(f)

Interpretation Introduction

Interpretation: The given terms, amphoteric, Kw, reaction, Kw equilibrium constant, pH, pOH, pKw .are to be defined and the given questions are to be answered.

Concept introduction: Amphoteric substances can act both as an acid and a base.

The self-ionization ionic product of water is Kw reaction.

The equilibrium constant of  Kw reaction of water is called Kw equilibrium constant.

The numeric scale that measures the hydrogen ion concentration of any chemical species is called pH.

The numeric scale that measures the hydroxide ion concentration of any chemical species is called pOH.

The negative log of the ionic product of water is called pKw.

To determine: definition of pKw.

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