   Chapter 7, Problem 65IL

Chapter
Section
Textbook Problem

Nickel(II) formate [Ni(HCO2)2] is widely used as a catalyst precursor and to make metallic nickel. It can be prepared in the general chemistry laboratory by treating nickel(II) acetate with formic acid (HCO2H).Ni(CH3CO2)2(aq) + 2 HCO2H(aq) → Ni(HCO2)2(aq) + 2 CH3CO2H(aq)Green crystalline Ni(HCO2)2 is precipitated after adding ethanol to the solution. (a) What is the theoretical yield of nickel(II) formate from 0.500 g of nickel(II) acetate and excess formic acid? (b) Is nickel(II) formate paramagnetic or diamagnetic? If it is paramagnetic, how many unpaired electrons would you expect? (c) If nickel(II) formate is heated to 300 °C in the absence of air for 30 minutes, the salt decomposes to form pure nickel powder. What mass of nickel powder should be produced by heating 253 mg of nickel(II) formate? Are nickel atoms paramagnetic?

a)

Interpretation Introduction

Interpretation:

The theoretical yield of Nickel (II) formate has to be calculated.

Concept Introduction:

Theoretical yield: It is the maximum mass of product that can be obtained from a chemical reaction

Paramagnetic: The Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.

Diamagnetic properties: In diamagnetic materials all the electron are paired so there is no permanent net magnetic moment per atom.

Explanation

Given the chemical reactions has shown below.

Ni(CH3CO2)2+2HCO2H(aq)Ni(HCO2)2(aq)+2CH3CO2H(aq)

To find the mass of product formed in the reaction, the amount of each reactant involved in the given reaction should be determined.

Themolarmassofnickelacetate=176.78gTheamountofNickelAcetate=0.500mg176.78=2.83×1003mol2

b)

Interpretation Introduction

Interpretation:

The magnetic property of Nickel (II) formate has to be predicted.

Concept Introduction:

Theoretical yield: It is the maximum mass of product that can be obtained from a chemical reaction

Paramagnetic: The Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.

Diamagnetic properties: In diamagnetic materials all the electron are paired so there is no permanent net magnetic moment per atom.

c)

Interpretation Introduction

Interpretation:

The mass of Nickel (II) formate powder has to be calculated.

Concept Introduction:

Theoretical yield: It is the maximum mass of product that can be obtained from a chemical reaction

Paramagnetic: The Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.

Diamagnetic properties: In diamagnetic materials all the electron are paired so there is no permanent net magnetic moment per atom.

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