Lesson Plan on Strength of Acids and Bases

Grade: IX                                                   Subject: Chemistry    Topic: Strength of Acids and Bases    Time: 45 minutes 

SLO: Students will be able to inquire the strength of different samples of acids and bases by using pH paper

Resources: Board, Marker, Duster, Water, Beaker, hydrochloric acid (HCl), nitric acid (HNO3), Sulphuric acid (H2SO4), acetic acid (CH3COOH), Sodium hydroxide (NaOH), potassium Hydroxide, Calcium hydroxide, Magnesium hydroxide.

Brainstorming (7 minutes)

Students will be asked questions like:

-What comes in your mind when you listen the words Acids and Bases?

-The responses will be written on board

-Students will also be asked that did they find any acid or base in their real life?

Topic Description (10 minutes)

-Teacher will discuss the responses of students. Teacher will discuss that what are the acids and bases. 

-Then, teacher will tell students about the strength of acids and bases. Teacher will explain that on what 

bases acids and bases are classified as strong or weak.

Activity 1 (15 minutes)

-The teacher will divide students into 4 groups of 4-6 students

-Teacher will provide samples of acids and bases to each group

-Each group will be asked to check the strength of  the samples acids and bases

-Each group will use pH paper to know the pH of acid and base and to determine the strength of acid or base

Then students will record their findings

-Then, they will discuss it in the group

-Then each group will present their findings and explain it in front of the class

Conclusion (3 minutes)

-Teacher will conclude the session with the help of the students 

Assessment Activity (10 minutes)

-Students will be provided with a worksheet to check the understanding of the students. The worksheet 

consists of a checklist, in which names of acids and bases are given and in front of those names, strong 

and weak is written in two columns and in 3rd column, students will be asked to write the reason that 

why they classified the acid or base as strong or weak

Reference Material:

-Sindh Textbook of Chemistry for Grade 9