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Important Points - Acids, Bases & Salts - Class 7 PDF Download

Important Points:

  • Acid is sour in taste.
  • Acid turns blue litmus paper to red.
  • Acid turns China rose solution to dark pink.
  • Base is bitter in taste.
  • Base turns red litmus paper to blue.
  • Base turns turmeric paper or solution to red.
  • Base turns China rose solution into green.
  • Indicator is a special substance which shows the acidic or basic character of a substance by change in colour.
  • Litmus, turmeric and solution of China rose are natural indicators.
  • Litmus is obtained from lichens.
  • Solutions of acid and base neutralize each other when mixed in proper ratio. This is called neutralization or neutralization reaction.
  • In neutralization reaction between the solutions of acid and base, a new substance called salt is formed.
  • Salt formed because of neutralization reaction may be acidic or basic in nature. The acidic or basic nature of salt depends upon the strength of acid and base used for neutralization reaction.
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FAQs on Important Points - Acids, Bases & Salts - Class 7

1. What is an acid?
Ans. Acids are substances that have a pH level of less than 7. They are sour in taste and can turn blue litmus paper to red. Acids react with bases to form salts and water.
2. What is a base?
Ans. Bases are substances that have a pH level of more than 7. They are bitter in taste and can turn red litmus paper to blue. Bases react with acids to form salts and water.
3. What are salts?
Ans. Salts are ionic compounds that are formed by the reaction of an acid and a base. They are formed when the hydrogen ions of an acid combine with the hydroxide ions of a base. Salts have a neutral pH level of 7.
4. What are the uses of acids, bases, and salts?
Ans. Acids are widely used in industries such as the chemical industry, pharmaceutical industry, and food industry. They are also used in batteries, cleaning agents, and fertilizers. Bases are used in the manufacture of soaps, detergents, and bleach. Salts are used in the production of medicines, fertilizers, and food preservation.
5. What are some common examples of acids, bases, and salts?
Ans. Some common examples of acids are vinegar, lemon juice, and hydrochloric acid. Some common examples of bases are baking soda, ammonia, and lye. Some common examples of salts are table salt (sodium chloride), baking powder (sodium bicarbonate), and Epsom salt (magnesium sulfate).
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