NIOS Class 10 Science and Technology Activity 8.1 Acids, Bases and Salts

This activity helps us understand the acidic nature of common food items used in our kitchen.

 NIOS Class 10 Science and Technology Project File

This activity is based on the NIOS Class 10 Science and Technology chapter 8: Acids, Bases, and Salts.

Aim of the activity

To test whether packaged curd and fruit juice are acidic or not

Materials Required

   1. Packaged curd

   2. Fruit juice in tetra packs

   3. Blue and red litmus paper

   4. Dropper

   5. Container

Procedure

We go to the shop and buy packaged curd and juice in a tetra pack.

We pour a small amount of each item into separate clean containers and dip the blue litmus paper into both items separately and observe the colour change.

 Now we test both items with red litmus paper and observe the colour change.

 Observation

   1. Blue litmus paper turns red when dipped in both curd and juice.

   2.  Red litmus paper shows no colour change with both curd and juice.

Explanation

Curd contains lactic acid, and fruit juice contains citric acid. These acids are organic acids.

Acids turn blue litmus red. The red litmus remains unchanged with both items, indicating that they are not alkaline.

Conclusion

 This activity demonstrates the nature of common food items like curd and fruit juice. These items contain organic acids that turn blue litmus red.

Frequently Asked Questions

 

    1.  Which acid does curd contain?

 Answer – Lactic acid

    2.  Name the acid present in the fruit juice in the tetra pack.

Answer – Citric acid

   3. Can this activity show the p^H of acids?

Answer – No, this activity only gives an indication of acidity or basicity.