Question

Take some water in a steel dish (figure). It is better if the water is from a borewell. Keep the water in direct sunlight. Do not remove the dish until all the water gets. evaporated. Observe the dish after the water has evaporated completely. What do you see? Taste the substance in the dish.

Answer 1

• After all the water evaporates, a thin white layer or small crystals of dissolved salts remain at the bottom of the dish. When tasted, the substance may taste salty or slightly bitter.
• This shows that borewell water contains dissolved minerals and salts. The water evaporates in sunlight, but these dissolved substances do not evaporate and are left behind in the dish.