Question

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which is probably causing the fish to die. (a) Explain why were the fishes dying. (b) How can this effect on water be neutralised? (c) Give an example of neutralisation in everyday life​

Answer 1

Answer:

Fishes were dying due to the disposal of waste materials by the factory in that river. Because the waste materials of the factory may contain a high amount of basic and acidic chemicals which affect the natural habitat of fishes.

Explanation:

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Answer 2

Question-

Paheli observed that most of the fish in the pond of her village were gradually dying. She also observed that the waste of a factory in their village is flowing into the pond which is probably causing the fish to die.

(a) Explain why were the fishes dying.

(b) How can this effect on water be neutralised?

(c) Give an example of neutralisation in everyday life​

Answer-

(a) The fishes were dying due to the contamination of the pond. The waste of the factory in their village is flowing into the pond is the cause of the contamination of the pond.

(b) The effect on the water can be neutralised. There are two scenarios, one where the waste is acidic, the other where the waste is basic.

1. Waste is acidic - If the waste is acidic, we can put a strong base into the pond. The base and the acid will react will each other and form H₂O and Salt. This is a neutralisation reaction.
2. Waste is basic - If the waste is basic, we can put a strong acid into the pond. The acid and the base will react with each other and form H₂O and Salt. This is also a neutralisation reaction.

(c) The example of neutralisation in everyday life are-

• During indigestion, too much acid is produced inside the stomach resulting in stomach disorder or acidity. In order to retrieve the pain, we take bases such as milk of magnesia which contains magnesium hydroxide. Taking a base neutralizes the effect of excess acid.
• The effect of ant sting is caused by formic acid which is neutralized by rubbing moist baking soda (basic in nature) which contains zinc carbonate.
• Whenever we eat something, the food molecules are decomposed by micro-organisms present in the mouth which further results in the formation of acid. This acid is responsible for tooth decay. Toothpaste help in neutralizing the effect of acid because they are alkaline in nature and neutralize the effect of acid. Have you ever noticed that why our hairs get rough after applying shampoo and again turn shiny after we add conditioner? This is because our shampoo is basic in nature and the conditioner is acidic in nature and that’s why it neutralizes the effect of the shampoo.
• Plants tend to grow in soil that has a very particular pH range. If the soil is acidic then we cannot grow plants in that soil. In order to grow plants in this type of soil, we have to add a basic compound such as limestone, powdered lime and the ashes of burnt wood in the soil. On the other hand. the basic soil can be treated with the compost of vegetables that are rotten. This restores the pH of the soil by neutralizing the effect of excess acids and bases in the soil.