Important Points - Acids, Bases & Salts Class 7 Notes | EduRev

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Class 7 : Important Points - Acids, Bases & Salts Class 7 Notes | EduRev

The document Important Points - Acids, Bases & Salts Class 7 Notes | EduRev is a part of Class 7 category.
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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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