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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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Section
BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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. Calculate the pH of each of the following solutions of strong acids.

a. 1.21 × 10 3 M HNO3

b. 0.000199 M HClO4

c. 5.01 × 10 5 M HCl

d. 0.00104 M HBr

Interpretation Introduction

(a)

Interpretation:

The pH of a solution having 1.21×103 M

HNO3 should be calculated.

Concept Introduction:

To express the small number, p scale is used, which implies to take the log of a number. Since, the concentration of [H+] in aqueous solution is small, by using the p scale in the form of pH scale, it is better way to represent acidity of solution.

Thus, pH = -log [H+].

Explanation

Since, HNO3 is a strong acid, thus it is completely dissociated into ions. The reaction is shown below:

HNO3H++NO3

Thus, concentration of HNO3 that is 1.21×103 M is equal to the [H+] and [NO3]

Therefore, [H+] = 1

Interpretation Introduction

(b)

Interpretation:

The pH of a solution having 0.000199 M

HClO4 should be calculated.

Concept Introduction:

To express the small number, p scale is used, which implies to take the log of a number. Since, the concentration of [H+] in aqueous solution is small, by using the p scale in the form of pH scale, it is better way to represent acidity of solution.

Thus, pH = -log [H+].

Interpretation Introduction

(c)

Interpretation:

The pH of a solution having 5.01×105 M

HCl should be calculated.

Concept Introduction:

To express the small number, p scale is used, which implies to take the log of a number. Since, the concentration of [H+] in aqueous solution is small, by using the p scale in the form of pH scale, it is better way to represent acidity of solution.

Thus, pH = -log [H+].

Interpretation Introduction

(d)

Interpretation:

The pH of a solution having 0.00104 M

HBr should be calculated.

Concept Introduction:

To express the small number, p scale is used, which implies to take the log of a number. Since, the concentration of [H+] in aqueous solution is small, by using the p scale in the form of pH scale, it is better way to represent acidity of solution.

Thus, pH = -log [H+].

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