ENGINEERING CHEMISTRY NOTES ON LESSON – II

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ENGINEERING CHEMISTRY

II

NOTES ON LESSON

UNIT

I

ELECTRO CHEMISTRY

Introduction to electrochemistry

Types of conductors

Types of electrolytes

Cell terminology

Electrochemical cells (or) galvanic cells

Daniel cell

Representation of a galvanic cell

Reversible and irreversible cells

EMF of a cell

Measurement of emf of a cell

Single electrode potential(E)

Standard electrode potential(E0)

Nernst equation for electrode potential

Problems based on nernst equation

Reference electrodes(or) standard electrodes

Primary reference electrode o

Standard hydrogen electrode

Secondary reference electrode o

Standard calomel electrode

Types of electrodes

Glass electrode(internal reference electrode)

Determination of PH of a solution using glass electrode

Ion selective electrodes (ISE)

Describtion

Types of ion selective electrodes o

Glass membrane electrode o

Solid state membrane electrode o

Liquid membrane electrode o

Heterogenous membrane electrode o

Enzyme electrode

Determination of concentration of a metal ion using ISE

Application of ISE

Limitations

Electro chemical series

Definition

Significance(or) applications of electrochemical series

Potentiometer titrations

Redox titration

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Conductometric titrations

Acid base titrations.

UNIT

II

CORROSION AND CORROSION CONTROL

Introduction to corrosion and its types

Chemical corrosion(dry corrosion) o

Pilling -Bedworth rule o

Mechanism of chemical corrosion o

Corrosion by oxygen o

Corrosion by hydrogen o

Liquid metal corrosion

Electro chemical corrosion (wet corrosion) o

Mechanism of electrochemical corrosion o

Evolution of hydrogen type o

Absorption of oxygen type o

Difference between chemical corrosion and electrochemical corrosion

 types of electrochemical corrosion

 galvanic corrosion

 differential aeration(or) concentration cell corrosion

 factors influencing the rate of corrosion

 nature of the metal

 nature of the environment

 corrosion control

 control of corrosion by modifying the metal

 by cathodic protection o sacrificial anodic protection method o impressed current cathodic protection method

 by modifying the environment

 corrosion inhibitors

 anodic inhibitors

 protective coatings

 types of protective coatings

 paints

 cathodic inhibitors

 vapour phase inhibitors

 constituents and their functions of a paint

 mechanism of drying of drying oil

 metallic coatings

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 electroless plating

 electro plating

 anodization

UNIT

III

FUELS AND COMBUSTION

Introduction, analysis of coal

The proximate analysis o

Determination of moisture in coal o

Determination of volatile matter in coal o

Determination of ash in coal o

Determination of fixed carbon

The ultimate analysis o

Determination of carbon and hydrogen in coal o

Determination of hydrogen o

Determination of nitrogen o

Determination of sulphur in coal o

Determination of oxygen in coal

Metallurgical coke

Characteristics of metallurgical coke

Manufacture of metallurgical coke by Otto Hoffmann

’ s

Petroleum of gasoline method

Processing and fractions

Cracking

catalytic cracking

Knocking

Octane number

Cetane number

Synthetic petrol

Bergius process (hydrogenation of coal)

Fisher- Tropsch process

Gaseous fuels

Water gas

Producer gas

Compressed natural gas ( CNG)

Liquefied petroleum gas (LPG)

Biogas

Calorific value

Units of calorific value

Determination of calorific value

Gross calorific value and net calorific value

Theoretical calculations of calorific values

Flue gas analysis: Orsat

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UNIT

IV

PHASE RULE AND ALLOYS

Introduction, explanation of terms involved

Phase

Component

Degree of freedom

Phase diagram

Phase rule

One component system

Water system

Condensed phase rule

Two component system

Simple eutectic systems (Binary alloys)

Lead

silver system

Construction phase diagram by thermal analysis

Copper

nickel alloy system

Alloys

Purpose of making alloys

Classification of alloys

Ferrous alloys

Nichrome

Stainless steel

Non ferrous alloys

Brass

Bronze

Heat treatment of steel

Hardening (quenching)

Tempering

Annealing

UNIT

V

ANALYTICAL TECHNIQUES

Explanation of terms used in absorption spectra

Beer

’ s

lamberts law

Problems

UV and visible spectroscopy

Principle

Instrumentation (block diagram only)

Problems

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Principles

Instrumentation (block diagram only)

Problems

Colorimetric estimation of few metal ions

Flame photometry

Estimation of iron

Principle

Instrumentation (block diagram only)

Estimation sodium by flame photometry

Atomic absorption spectroscopy

Principle

Instrumentation (block diagram only)

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