   Chapter 15, Problem 116AP ### Introductory Chemistry: A Foundati...

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

#### Solutions

Chapter
Section ### Introductory Chemistry: A Foundati...

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

# When 200.0 mL of 0.10M Zn(NO)2 is mixed with 100.0 mL of 0.10 M KOH, a precipitate forms. a. How many moles of precipitate can form in this reaction? b. Calculate the concentration of Zn2+ ions in the final solution after precipitate formation is complete.

Interpretation Introduction

(a)

Interpretation:

The moles of precipitate that can form in the given reaction are to be calculated.

Concept Introduction:

The atomic mass of an element is defined as the sum of number of protons and number of neutrons. Molar mass of an element is determined from atomic mass of an element.

The number of moles is calculated by the formula,

Moles=MassgMolarmass

The molarity is calculated by the formula,

Molarity=NumberofmolesofsoluteVolumeofsolutionL.

Explanation

The molarity and volume of ZnNO32 solution is 0.10M and 200.0mL respectively.

The conversion of units of 200.0mL into L is done as,

200.0mL=200.01000L=0.2L

The number of moles ZnNO32 is calculated by the formula,

Moles=Molarity×Volume        (1)

Substitute the values of molarity and volume in the equation (1).

Moles=0.10M×0.2L=0.02moles

The molarity and volume of KOH solution is 0.10M and 100.0mL respectively.

The conversion of units of 100.0mL into L is done as,

100

Interpretation Introduction

(b)

Interpretation:

The total concentration of Zn2+ ions in the final solution after the formation of precipitations is to be calculated.

Concept Introduction:

The atomic mass of an element is defined as the sum of number of protons and number of neutrons. Molar mass of an element is determined from atomic mass of an element.

The number of moles is calculated by the formula,

Moles=MassgMolarmass

The molarity is calculated by the formula,

Molarity=NumberofmolesofsoluteVolumeofsolutionL.

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