This lesson plan outlines a chemistry lesson for 9th standard students about acids and alkalis. The teacher will engage students through discussion, videos, and hands-on activities to develop their factual, conceptual, and procedural knowledge of alkalis. Students will learn that alkalis are substances that turn red litmus paper blue and cause phenolphthalein to change color. Through observing chemical reactions and group work, students will identify common alkalis like baking soda, lime, and soap and understand that their bitter taste comes from being alkaline substances.

1. CREATIVE LESSON PLAN
Name of the Teacher : Aswathy R Standard : IX
Name of the School : Strength :
Subject : Chemistry Duration : 40
Mins
Unit : Acids and Alkalis Date :
Topic : Alkali Stage :14+
CURRICULAR STATEMENT:
Pupils develops factual knowledge, conceptual
knowledge and procedural knowledge on the concept of alkali and its
role in our life through observation, discussion and experimentation by
questioning , participation in practical work and group discussion.
CONENT ANALYSIS:
Terms : Alkali
Facts : 1. Baking soda is bitter in taste.

2. 2. Soap has bitter taste
3. NaOH turn red litmus to blue.
4. Phenolphthalein shows thin color in alkali.
5. Lime is an alkali used for reducing acidity of soil.
CONCEPTS:
Minor Concepts:
1) Alkalis are bitter in taste.
2) Alkali changes red litmus to blue.
3) It does not react with metals.
4) It has soapy touch.
5) Phenolphthalein shows pink color in alkali.
Major Concepts:
1) The substance which gives OH(-) ions in solution is
called Alkali.
2) The common factor in alkali is OH(-) ion.

3. LEARNING OUTCOMES:
Enable the pupil to develop,
1) Factual knowledge on alkali by
a) Recalling various examples of alkali.
b) Base is alkaline in nature
c) Recognize alkali in different substances.
2) Conceptual knowledge on alkali by
a) Explaining the properties of alkali.
b) Illustrating various properties of alkali.
c) Uses the concept of alkali in new or unfamiliar situations.
3) Procedural Knowledge on alkali by
a) Doing activities by dipping litmus paper in alkali.
b) Raising questions on various alkali
4) Metacognitive knowledge on alkali and its role in our life by
a) Focusing the idea the most of washing material contain base.
b) Generating suggestions for the contamination of alkali outcomes
from
factories to water bodies.

4. c) Judging the quality of food items containing bases in our daily life.
5) Different process skills like observing , making operational definition ,
inferring, communicating etc.
6) Attitude towards science.
PREREQUISITES:
Students are aware about alkalis commonly used and its uses.
TEACHING LEARNING RESOURCES
Materials for experiment
a) Red litmus paper
b) NaOH
c) Test tube
d) Phenolphthalein
Group discussion, demonstration, observation, experimentation etc

5. Classroom Interaction Procedure Pupil Response
INTRODUCTION
• Have you all taken bath today?
• Did you use soap for that ?
• What do you feel when we touch
wet soap?
• Have you ever tasted soap?
• What does its taste?
• Do you know why it tastes bitter ?
Now, we are going to
study the reason for the bitter taste of
soap.

6. Thus teacher enters into the lesson.
ORIENTATION
Teacher divides the students
into different groups.
PRESENTATION
Activity 1
Teacher shows a video of
action of alkali on the red litmus paper
and ask them to write their observation
in science dairy.
Click on Video to watch

7. Discussion Clues
1) Is there any change occur?
2) What is the change occurred ?
3) Do you know the reason for
change?
4) If the color of the litmus is blue,
what will happen ?
Concepts to be consolidated:
1) Alkalis are substances which turn
red litmus to blue
2) If the litmus paper is blue no
change occurs.
Activity 2
Teacher shows a video of adding
phenolphthalein into alkali and ask
them
to write their observation on their
science dairy

8. NaOH reaction with
Phenolphthalein
Discussion Clues:
1) Is there any change occur?
2) What do you observe?
3) What is the color change?
4) Why does it turned pink in
color?
Concepts to be consolidated
1) Phenolphthalein shows pink color
in alkaline solution.

9. APPLICATION LEVEL EXPERIENCE
Find out alkalis present in the
following.
1) Baking soda
2) Lime
3) Soap
4) Antacids
REVIEW
1) What is alkali?
2) Give example for alkali?
3) What are the properties for alkali?
4) Does metals react with alkalis?
5) What is the color change occur
when react with phenolphthalein?
FOLLOW UP ACTIVITY
Find out more examples of alkali
from your daily life