Name: pH Scale
Uploaded: 2019-07-19
Duration: 9 min 45 s
Description: This video discusses the pH of acids, bases, and salts and also the limitations of using a pH scale for identification. The natural indicators do the verific...

Question

Find the acidic or basic nature of some substances used in daily life.

Materials: Substances to examine red and blue litmus papers, dropper.

Let's do: Place a few red and few blue litmus paper strips on a surface. Put a drop of a solution of substances on each strip and observe the change in colour.

Observation:

Sr. No.	Solution	Effect on blue litmus paper	Effect on red litmus paper	Inference
1	Lemon water
2	Detergent solution
3	Soap solution
4	Table salt solution
5	Hydrochloric acid
6	Sodium hydroxide
7	Shampoo
8	Baking soda solution
9	Lime water

Accepted Answer

Observation:

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

1 Lemon water Changes to red No change Acidic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

2 Detergent solution No change Changes to blue Basic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

3 Soap solution No change changes to blue Basic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

4 Table salt solution No change No change Neutral

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

5 Hydrochloric acid Changes to red No change Acidic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

6 Sodium hydroxide No change Changes to blue Basic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

7 Shampoo No change Changes to blue Basic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

8 Baking soda solution No change Changes to blue Basic

S. No. Solution Effect on blue litmus paper Effect on red litmus paper Inference

9 Lime water No changes Changes to blue Basic

Conclusion: Acid turns blue litmus red, and base turns red litmus blue.

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