Chapter Review:
- Acids are sour substances which are found in curd, lemon juice, orange juice and in vinegar.
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Substances like these which are bitter in taste and feel soapy on touching are known as bases. EX:- baking soda, soap and milk of magnesia.
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A special kind of substances are used to identify the acids and bases, these are called indicator.
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A natural indicator is Litmus paper.
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Such a solution which does not change the colour of red and blue litmus paper is called neutralised solution.
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Such a reaction in which acid and base nutralise the effect of each other is known as neutralization.
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The food does not digest properly in our stomach due to excess of hydrochloric acid (acidity) this is known as indigestion.
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A new substance is produced in neutralisation reaction is known as salt.
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Acid turns blue litmus red. Bases turn red litmus blue.