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Questions and Answers
What is the nature of substances that turn blue litmus to red litmus?
What is the nature of substances that turn blue litmus to red litmus?
What is the sensation caused by when bitten by an ant?
What is the sensation caused by when bitten by an ant?
What is the nature of oxides of magnesium when dissolved in water?
What is the nature of oxides of magnesium when dissolved in water?
What is the formula for magnesium hydroxide?
What is the formula for magnesium hydroxide?
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What is the characteristic of basic substances?
What is the characteristic of basic substances?
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Study Notes
Acidic and Basic Substances
- Substances that turn blue litmus paper red are acidic.
- Substances that turn red litmus paper blue are basic.
- Neutral substances do not change the color of either red or blue litmus paper.
Natural Acids
- Formic acid, released by ant bites, causes a burning sensation.
- Natural acids are found in plants and animals and are part of everyday life.
Mineral Acids
- Common mineral acids include hydrochloric acid, sulfuric acid, and nitric acid.
- These are synthetically prepared from minerals.
Basic Substances
- Basic substances feel soapy to the touch.
- Oxides such as magnesium oxide, potassium oxide, and sodium oxide are basic when dissolved in water, forming hydroxides.
- Magnesium oxide specifically forms magnesium hydroxide in water.
Chemical Formula
- The formula for magnesium hydroxide is Mg(OH)₂.
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Description
Understand the characteristics and effects of acids, bases, and neutral substances, including their interactions with litmus and the presence of natural acids in plants and animals.
