   Chapter 4.6, Problem 4.8CYU

Chapter
Section
Textbook Problem

(a) What is the pH of a solution of HCI in which [HCI] = 26 × 10‒2 M? (b) What is the hydronium ion concentration in orange juice with a pH of 3.80?

(a)

Interpretation Introduction

Interpretation:

pH of the given solution of HCl has to be calculated.

Concept introduction:

• pH of a solution is the negative of the base -10 logarithm of the hydronium ion concentration.

pH=-log[H3O+]

• Concentration of hydronium ion [H3O+]=10-pH
• For an acidic solution pH<7 and for a basic solution pH>7
Explanation

HCl is a strong acid and it is completely ionized in aqueous solution. Because the concentration of HCl is 2.6×10-2M the ion concentrations are also HCl.

[H3O+]=[Cl-] =2

(b)

Interpretation Introduction

Interpretation:

The hydronium ion concentration of orange juice should be determined.

Concept introduction:

• pH of a solution is the negative of the base -10 logarithm of the hydronium ion concentration.

pH=-log[H3O+]

• Concentration of hydronium ion [H3O+]=10-pH
• For an acidic solution pH<7 and for a basic solution pH>7

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