UBSE - 7 - Science :: Acids, Bases and Salts

Go To: UBSE-Sci-Grade 7

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Course Content / Subtopic list:

Acids and Bases
Natural indicators around us
Neutralisation
Neutralisation in everyday life

Expected Learning Outcome:

SWBAT-

Define Natural indicators with ex
Distinguish between Acids and Bases with ex
Describe the Neutralization

Lesson Plan

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[Edition 2022]

Acids, Bases and Salts Lesson Plan - (Lesson Plan - English)

[Edition 2019]

https://drive.google.com/open?id=15g2UyFgiN30gg8EbpVfHQTahlQ-YXJmY (Lesson Plan - English)

https://drive.google.com/open?id=1_4qJ-mzj07F6Bwjo_gHxM5gPmwUw0_wB (PPT - English)

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The worksheets of the lesson can be accessed from the worksheet tab.

Videos

[Author - Shachi Patel, Kripa S]

https://www.youtube.com/watch?v=wt3OhFeSNi4 (Hindi - Acids, Bases and Salt)

https://www.youtube.com/watch?v=UjO4pjtMneg (Hindi - Properties of acids/bases/salts)

[Contributor - Suhas B]

Lesson Plan version 1.1 videos

https://www.youtube.com/watch?v=Bnj2lpD0Z3w (litmus juice as natural indicator)

https://www.youtube.com/watch?v=Olezbt9cxfo (Turmeric as natural indicator)

Images

[Author - Anu Nived]

http://www.scienceclarified.com/photos/acids-and-bases-real-life-applications-3031.jpg (lime - citric acid)

http://bucataritza.ro/wp-content/uploads/2015/10/turmeric-masca-faciala-1024x849.jpg (natural indicator)

https://userscontent2.emaze.com/images/98dd86a5-3860-4477-83c9-4f272fef0f23/aa94c694ded179d97311cadbf26cbb01.jpeg(base example)

http://worldoffloweringplants.com/wp-content/uploads/2013/12/Hibiscus-rosa-sinensis3.jpg (china rose -natural indicator)

Activities

[Author - Arshea Bimal]

1. Ask students to name some common objects that contain acids, bases and salts.

2. Take a tablespoonful of turmeric powder. Add a little water and make a paste. Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it. Cut thin strips of the yellow paper obtained. Put a drop of soap solution on the strip of turmeric paper. What do you observe?

3.Name some common objects containing neutral components.

[Contributor- Suhas B]

lesson Plan version 1.1 activities

1. Take some lemon juice in a cup and add a drop of red litmus to it. Note the colour change. Repeat the same by adding blue litmus and note the colour change. Repeat the experiment for the following substances: Tap water, detergent solution, aeriated drink, soap solution, shampoo, common salt solution, sugar solution, vinegar, baking soda solution, milk of magnesia, washing soda solution, lime water

2. Make a paste of turmeric with water and blot it on filter paper/blotting paper. Cut into thin strips. Put a drop of soap solution on it.

3. Take china rose petals in a beaker, pour hot water over it and keep it until the water changes colour. Use this coloured water as an indicator. Test hydrochloric acid solution with this indicator.

4. Demonstrate the effect of hydrochloric acid, sulphuric acid, nitric acid, acetic acid, sodium hydroxide, ammonium hydroxide, calcium hydroxide (lime water) on litmus, turmeric and china rose solution

5. Fill one fourth of a test-tube with dilute hydrochloric acid. Note its colour and the colour of phenolphthalein solution. Add 2-3- drops of phenolphthalein solution to the test tube. To this solution, gently add a drop of sodium hydroxide solution and stir. Continue to add sodium hydroxide solution drop by drop, stir and observe any colour change. Stop adding as soon as the mixture turns pink. Touch test tube immediately, you will notice that it is hot. Now add a drop of hydrochloric acid solution. Note colour change. Add a drop of sodium hydroxide solution and note the colour change.