Introduction to Chemistry
Introduction to Chemistry
4th Edition
ISBN: 9781259288722
Author: BAUER
Publisher: MCG
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Chapter 11, Problem 131QP

(A)

Interpretation Introduction

Interpretation:

Whether the response, “The solution is 0.20M in the molecules of Mg(NO3)2 � is correct or not for the given statement is to be identified.

(A)

Expert Solution
Check Mark

Explanation of Solution

Consider the given statement, “The dissolution process of Mg(NO3)2 in water forms 0.20M solution�.

Mg(NO3)2 is an example of a strong ionic electrolyte. It is completely dissociated when added to water. The dissolution process of Mg(NO3)2 in water can be expressed by the following equation:

Mg(NO3)2s+H2O(l)Mg2+aq+2NO3aq ……(1)

The given response is incorrect because in water, Mg(NO3)2 dissociates completely to form Mg2+ and NO3 ions. So, no individual molecule of Mg(NO3)2 is present in the water solution.

(B)

Interpretation Introduction

Interpretation:

Whether the response, “ The solution is 0.20M in both Mg2+ and (NO3)22 ions� is correct or not for the given statement is to be identified.

(B)

Expert Solution
Check Mark

Explanation of Solution

The given statement, “The dissolution process of Mg(NO3)2 in water forms 0.20M solution�.

In water, Mg(NO3)2 dissociates completely to form Mg2+ and NO3 ions. The individual concentration of the ions formed by dissolution depends on the mole ratio of the ions from the balanced equation (1). The mole ratio of Mg2+ and NO3 ions is 1:2 . Thus, if 1 mole of Mg(NO3)2 is added to water, it forms 1 mole of Mg2+ ions and 2 moles of NO3 ions.

Therefore, the given response is an incorrect response.

(C)

Interpretation Introduction

Interpretation:

Whether the response “ The solution is 0.20M in Mg2+ and 0.40M in NO3 ions� is correct or not for the given statement is to be identified.

(C)

Expert Solution
Check Mark

Explanation of Solution

The given statement, “The dissolution process of Mg(NO3)2 in water forms 0.20M solution�.

The mole ratio of Mg2+ and NO3 ions formed in water from equation (1) is 1:2 . The given concentration of Mg(NO3)2 solution in water is 0.20M .

So, the concentration of Mg2+ ion is:

1×0.20M=0.20M .

The concentration of NO3 ions is:

2×0.20M=0.40M .

Hence, the given response is correct as it best describes the dissolution process of Mg(NO3)2 in water to form 0.20M solution.

(D)

Interpretation Introduction

Interpretation:

Whether the given response, “The solution is 0.40M in total ions present� is correct or not for the given statement is to be identified.

(D)

Expert Solution
Check Mark

Explanation of Solution

The given statement, “The dissolution process of Mg(NO3)2 in water to form 0.20M solution�.

The total concentration of the ions present in the aqueous solution is calculated by adding the concentration of both magnesium and nitrate ions.

0.20M Mg2++0.40M NO3=0.60M

Since the total concentration of ions in the solution is 0.60M , the given response is an incorrect response.

(E)

Interpretation Introduction

Interpretation:

Whether the given response, “ Mg(NO3)2 is insoluble in water, thus no formation of ions takes place� is correct or not for the given statement is to be identified.

(E)

Expert Solution
Check Mark

Explanation of Solution

Consider the given statement, “The dissolution process of Mg(NO3)2 in water forms 0.20M solution�.

Mg(NO3)2 is a strong electrolyte and it completely dissociates in water to form Mg2+ and NO3 ions.

Therefore, the given response is an incorrect response.

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Chapter 11 Solutions

Introduction to Chemistry

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