   Chapter 18, Problem 95E

Chapter
Section
Textbook Problem

# What mass of each of the following substances can be produced in 1.0 h with a current of 15 A?a. Co from aqueous Co2+b. Hf from aqueous Hf4+c. I2 from aqueous KId. Cr from molten CrO3

(a)

Interpretation Introduction

Interpretation: The mass of each of the following substances produced in one hour with a current of 15 A is to be calculated.

Concept introduction: The mass of molten salt and ionic solution is calculated by the process of electrolysis in which an electric current is passed through a molten salt or either an ionic solution. In the process of electrolysis the ions are forced to undergo redox reactions or either an oxidation or reduction reaction.

To determine: The mass of Co from aqueous Co2 in one hour with a current of 15 A .

Explanation

Explanation

The mass of Co from aqueous Co2 is 16.4 g_ .

Given

Current (C) is 15 A .

The conversion of A to C/s is done as,

1A=1 C/s

Therefore, the conversion of 15A to C/s is done as,

15 A=15 C/s

Time (t) is 1.0 hr .

The conversion of hr to sec is done as,

1hr=60min=3600 sec

Therefore, the conversion of 1 hr to sec is done as,

1 hr=3600 sec

The atomic weight of Cobalt is 58.93 g/mol .

The equivalent weight of Cobalt is calculated by using the formula,

Equivalent weight of Cobalt = Atomic weight of CobaltNumber ofvalence electrons

Substitute the value of atomic weight of Cobalt and number of valence electrons in the above expression.

Equivalent weight of Cobalt = Atomic weight of CobaltNumber ofvalence electrons=58.93 g/mol2e=29.465 g/mol e

Hence, the electro chemical equivalent (Z) of Cobalt is calculated by using formula,

Z=Equivalent weightF

Where,

• F is the faradays constant (96,485 C/mol e)

(b)

Interpretation Introduction

Interpretation: The mass of each of the following substances produced in one hour with a current of 15 A is to be calculated.

Concept introduction: The mass of molten salt and ionic solution is calculated by the process of electrolysis in which an electric current is passed through a molten salt or either an ionic solution. In the process of electrolysis the ions are forced to undergo redox reactions or either an oxidation or reduction reaction.

To determine: The mass of Hf from aqueous Hf4+ in one hour with a current of 15 A .

(c)

Interpretation Introduction

Interpretation: The mass of each of the following substances produced in one hour with a current of 15 A is to be calculated.

Concept introduction: The mass of molten salt and ionic solution is calculated by the process of electrolysis in which an electric current is passed through a molten salt or either an ionic solution. In the process of electrolysis the ions are forced to undergo redox reactions or either an oxidation or reduction reaction.

To determine: The mass of I2 from aqueous KI in one hour with a current of 15 A .

(d)

Interpretation Introduction

Interpretation: The mass of each of the following substances produced in one hour with a current of 15 A is to be calculated.

Concept introduction: The mass of molten salt and ionic solution is calculated by the process of electrolysis in which an electric current is passed through a molten salt or either an ionic solution. In the process of electrolysis the ions are forced to undergo redox reactions or either an oxidation or reduction reaction.

To determine: The mass of Cr from molten CrO3 in one hour with a current of 15 A .

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