SRI PRAKASH VIDYANIKETAN
Chapter Plan: Acids, Bases and Salts
Class: VII
Month: June
Subject: Science
periods: 8
No. of
Chapter: Acids, Bases and Salts
Concepts:
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Acids, Bases and Their Indicators
Salts and Neutralization Reactions
Understand the difference between acids, bases, and neutral substances
List the properties and uses of important acids, bases, and salts
INTRODUCTION:
Start by discussing with students the concept of pH and how it is used to measure the acidity or basicity
of a substance. Briefly introduce the terms "acid," "base," and "salt," and explain their general
properties.
All substances are divided into three categories; acids, bases, neutrals and neutral substances. Acids and
bases are some of the important substances on earth. There are strong and weak acids and bases and
their strengths are described using the pH scale
Learning Objectives:
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Explain what indicators are and list some common natural and synthetic indicators
Prepare and use natural indicators
Describe pH scale and universal indicator
Explain neutralization reactions and their use in everyday life
Understand how salts are formed and differentiate between neutral. acidic, and basic salts
The learner:
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differentiates between acids, bases, and neutral substances.
defines indicators, and differentiates between natural and synthetic indicators.
Learning Outcomes:
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conducts simple investigations to prepare natural indicators.
describes pH scale and universal indicator.
defines neutralization reaction and writes word equations for it.
lists the properties and uses of some important salts, and
differentiates between neutral, acidic, and basic salts.
gives some applications of neutralization reactions.
METHODOLOGY:
Acids, Bases, and Their Indicators
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Start by recalling the need for sorting and classifying materials based on common properties.
Introduce classification of materials into acidic, basic, and neutral categories
Acids are sour in taste while bases are bitter and they have a soapy Touch. Students be warned
not to taste unknown substances on their own, without consulting an adult Give more examples
of acidic basic and neutral substances and ask the students to classify them
Discuss about bases and properties in comparison to the acids.
Introduce the terms alkali, strong bases, and weak bases, and differentiate between them. Give
examples.
Explain to the students the role of acids and bases in everyday life.
Ask the students if tasting of unknown substances is not advisable, how do we determine the
nature of an unknown solution? Lead to the concept of indicators.
Prepare some natural indicators and bring it to the class. Allow students to test them on dilute
samples of some common in acids and bases and record the colour changes in their notebooks.
Caution students to be careful while using acids and bases. Introduce litmus paper and litmus
solution as the most commonly used indicators. Demonstrate their use. Point out that neutral
substances, such as water, salt, etc., do not cause any change in the colour of an indicator.
Introduce synthetic indicators, for example, phenolphthalein and methyl orange. Demonstrate
the effect of both on acids and bases.
You may also create a fun quiz between two teams of students to identify indicators and their
respective colour changes in the presence of acids/bases.
Refer the students to Science in Action section and ask them to attempt relevant questions. Ask
the students if they can tell whether an acid/base is strong or weak, with the help of indicators.
Introduce the concept of universal indicator, pH scale, and pH paper strips.
Now, again refer them to the Science in Action section and ask them to attempt relevant
questions.
Refer the students to Science in Action section and ask them to attempt question 2 of the
Creating questions. The pH paper can be held against a standard colour chart. This will be quite
interesting for students as here they get to differentiate between strong and weak acids and
bases. Discuss the Recall section under the concept in the Workbook.
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Ask students to work on the relevant part of the I Can section in the Workbook, to assess their
learning of Acids, Bases, and Their Indicators.
Homework
Workbook Worksheet 5.1
Workbook Science in Action
Neutralization Reactions and salts
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Ask the students if anyone has experienced acidity and how antacids provider in such
conditions. Help them see that a base can neutralize the effect of an acid neutralization reaction
and what
State what is a Demonstrate the neutralization reaction of see that neutralization are its
products reaction is an exothermic reaction.
Discuss the different neutralization reactions that occur in our everyday life.
Again refer the students to attempt the relevant questions under Science in Action section .
Ask students what comes to their minds when they hear the word "salt” .Tell them common salt
is not only salt there is. Give examples of some more salts and their uses.
It must be clarified to students that salt in chemistry is a substance that is formed as a result of
the not the only salt that common salt is neutralization reaction when an acid and a base react
Discuss some characteristic properties of salts.
Ask students to work on the relevant part of the I Can section in the Workbook, to assess their
learning of Salts and Neutralization Reactions
Homework
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Workbook: Worksheet 5.2
Research on the common salts required by the body.
Teaching Aids :
Active Inspire boards, Materials required for activities, worksheets and textbook, Activity Kits
Recapitulation:
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Refer the Concept map in the Workbook. Discuss in class.
Discuss any remaining questions in the Worksheets or the Science in Action section
Homework/ASSIGNMENT:
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Workbook: Science in Action
Class test will be conducted
INCHARGE SIGN