M4 CHEMISTRY
S2 Q4 : Organic Chemistry
Carboxylic acid
Global context
Patterns and Models
Key concept
System
Related concept
Personal and Cultural Expression
Statement of Inquiry
Scientist discern different patterns of organic compounds into families with similar forms and
follow the same patterns when reacting with other substances to form a system with rules which
help to explain how it works in real world situations..
KUD
K
1. Describe the carboxylic acid as a homologous series
containing the –COOH group.
2.Draw the structures of carboxylic acid, C1 to C5, and name the
unbranched carboxylic acid,
U
Physical and chemical properties of carboxylic acid
D
Discussion on the use of carboxylic acid in different industries
Where are carboxylic acid found?
What is carboxylic acid
Preparation of carboxylic acid
Naming of carboxylic acid
RECAP General formula of carboxylic acid--- CmH2m+1COOH;
m=0,1,2,3,4……
Naming of Carboxylic acid
self assessment 1
Molecular formula of carboxylic
acid
Name of the carboxylic acid
HCOOH
Ethanoic acid
Propanoic acid
Butanoic acid
C6H13COOH
Properties of carboxylic acid
Weak Acid
Weak Acid
Link the observation to the corresponding
properties of carboxylic acid
Water soluble
Characteristic smell
Weak acid
Weak acid
High melting point and
boiling point
Statement of Inquiry
Scientist discern different patterns of organic compounds into families with similar forms and
follow the same patterns when reacting with other substances to form a system with rules which
help to explain how it works in real world situations..
Chemical properties of carboxylic acids
Chemical properties of carboxylic acids
Substance added
observation
A few drops of
universal indicator
Indicator turns yelloworange
3cm3 of sodium
hydroxide
No observable changes
Half a spatula of
sodium carbonate
Release of gas bubbles
A piece of magnesium
ribbon
Release of gas bubbles
Explanation
Weak acid
Neutralisation process
Carbon dioxide is
produced
Hydrogen gas is
produced
Reactivity of carboxylic acid
Reactivity of carboxylic acid
1.
+ Lithium + lithium hydroxide
lithium ethanoate +
water
2.
3.
+ iron (ii) hydroxide
ethanoic acid + calcium carbonate
iron(ii) methanoate + water
+ CO2 + H2O
Statement of Inquiry
Scientist discern different patterns of organic compounds into families with similar forms and
follow the same patterns when reacting with other substances to form a system with rules which
help to explain how it works in real world situations..
Carboxylic acids in descalers
Carboxylic acid in fatty acids
KUD
Exit Task
No. of C Name of
Atoms
Alcohol
2
Ethanoic
acid
3
Propanoic
acid
4
Butanoic
acid
5
Pentanoic
acid
Formula
Structure
Asynchronous activity
• In a group of 4, discuss the use of carboxylic
acid in different industries, connect your
statements to OWF ( environment, social,
economy)
Exp
1. Food industry
2. Medical industry
3. Cosmetic industry