Conduct an experiment with hibiscus paper on buttermilk, water, coconut oil, vinegar, soap solution, sugar solution, salt solution, tamarind water and milk. Which are the liquids that turned the hibiscus paper red?

Have you noticed the bottle and its stopper, used to store acid in the laboratory? Why are metal stoppers not used?

The pickles we commonly use are acidic in nature. Are they stored in metal containers?

You can dip red hibiscus paper and red litmus paper in water, buttermilk, vinegar, soap solution, lime water, salt solution, sugar solution, milk and clear ash suspension, and observe what happens. Which are the liquids in which red hibiscus paper turns blue? Which are the liquids in which red litmus paper turns blue?

Just as you prepared hibiscus paper, you can prepare similar papers by rubbing different substances on white paper. What are the substances that can be used?