Exploring Substances: Acidic, Basic, and Neutral
Short Questions
1. What is an acid?
Answer: An acid is a substance that turns blue litmus paper red.
2.What is a base?
Answer: A base is a substance that turns red litmus paper blue.
3.What is a neutral substance?
Answer: A neutral substance does not change the color of litmus paper.
4.What is litmus paper used for?
Answer: Litmus paper is used to test if a substance is acidic or basic.
5.What color does red rose extract turn in an acidic solution?
Answer: It turns red.
6.What happens to turmeric paper in a basic solution?
Answer: It turns red.
7.What is a neutralization reaction?
Answer: It is when an acid and a base mix to form salt and water.
8.Name one natural indicator.
Answer: Red rose extract.
9.What acid is found in lemon juice?
Answer: Citric acid.
10.Why do ant bites sting?
Answer: They inject formic acid into the skin.
Long Questions
1. How can you test if a substance is acidic, basic, or neutral using litmus paper?
Answer: Put a drop of the substance on blue and red litmus paper. If blue turns red, it’s acidic; if red turns blue, it’s basic; if no change, it’s neutral.
2.What happens when you mix an acid with a base?
Answer: They neutralize each other, forming salt and water. Heat is also released in the process.
3.How can red rose extract be used as an indicator?
Answer: Add red rose extract to a substance; it turns red in acidic solutions and green in basic solutions. This shows the nature of the substance.
4.Why is turmeric paper useful for testing basic substances?
Answer: Turmeric paper turns red when a basic substance is applied. It does not change color for acidic or neutral substances.
5. How can neutralization help in daily life, like treating an ant bite?
Answer: An ant bite injects acid, causing pain. Applying a base like baking soda neutralizes the acid and relieves the pain.
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