Activity 2.2 Let us relate and explore Find out and write the names of the most common acids Class 7

Activity 2.2 Let us relate and explore Class 7

Activity 2.2 Let us relate and explore Class 7

Question 1.

Find out and write the names of the most common acids present in the following substances- Class 7

Answer:

Lemon: Citric acid, Curd: Lactic acid, Tamarind: Tartaric acid, Vinegar: Acetic acid.

Question 2.

If litmus is not available, are there some other natural substances that can serve as acid-base indicators? Class 7

Answer:

Yes, there are other natural substances like as purple cabbage, beetroot, Indian blackberry (jamun), red hibiscus (gudhal), turmeric, and red rose can be used as acid-base indicators. These substances also change colour in the presence of acids or bases. Extracts of above are to be prepared.