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Acids, Bases & Salts Class 7 PPT
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Page 1 Acids, Bases & Salts C L A S S - 7 Page 2 Acids, Bases & Salts C L A S S - 7 Acids and Bases Many substances that you encounter in your daily life have different properties. Substances have either acidic, basic or neutral properties. Page 3 Acids, Bases & Salts C L A S S - 7 Acids and Bases Many substances that you encounter in your daily life have different properties. Substances have either acidic, basic or neutral properties. Acids are substances that taste sour and include natural acids found in items like curd, vinegar, lemon, and orange juice. They exhibit acidic properties. Bases are substances that taste bitter, feel slippery to the touch, and include items like baking soda and milk of magnesia. Acids and Bases Page 4 Acids, Bases & Salts C L A S S - 7 Acids and Bases Many substances that you encounter in your daily life have different properties. Substances have either acidic, basic or neutral properties. Acids are substances that taste sour and include natural acids found in items like curd, vinegar, lemon, and orange juice. They exhibit acidic properties. Bases are substances that taste bitter, feel slippery to the touch, and include items like baking soda and milk of magnesia. Acids and Bases Indicators are special substances used to determine if something is acidic or basic. These substances change color when added to an acidic or basic solution. Some natural indicators include litmus, turmeric, and china rose petals. Indicators Page 5 Acids, Bases & Salts C L A S S - 7 Acids and Bases Many substances that you encounter in your daily life have different properties. Substances have either acidic, basic or neutral properties. Acids are substances that taste sour and include natural acids found in items like curd, vinegar, lemon, and orange juice. They exhibit acidic properties. Bases are substances that taste bitter, feel slippery to the touch, and include items like baking soda and milk of magnesia. Acids and Bases Indicators are special substances used to determine if something is acidic or basic. These substances change color when added to an acidic or basic solution. Some natural indicators include litmus, turmeric, and china rose petals. Indicators 1.Litmus: A common natural indicator extracted from lichens. Litmus is purple in a neutral solution, red in an acidic solution, and blue in a basic solution. For instance, when lemon juice is added to red litmus, it remains red, indicating its acidic nature. Blue litmus turns red in the presence of acids. Natural IndicatorsRead More
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FAQs on Acids, Bases & Salts Class 7 PPT
| 1. What is an acid? |  |
Ans. An acid is a substance that donates protons (H+) when dissolved in water, resulting in an increase in the concentration of hydrogen ions. Acids have a pH less than 7 and can react with metals, turn blue litmus paper red, and have a sour taste.
| 2. What is a base? | |
Ans. A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) when dissolved in water, resulting in a decrease in the concentration of hydrogen ions. Bases have a pH greater than 7 and can react with acids, turn red litmus paper blue, and have a bitter taste.
| 3. What are the properties of salts? | |
Ans. Salts are compounds formed by the reaction of an acid with a base. They are ionic compounds that consist of a cation (from the base) and an anion (from the acid). Salts are generally solid at room temperature, have high melting and boiling points, and can conduct electricity when dissolved in water.
| 4. How do acids and bases react with each other? | |
Ans. Acids and bases can neutralize each other through a chemical reaction called neutralization. In this reaction, the acid donates protons (H+) to the base, forming water and a salt. The pH of the resulting solution depends on the strength of the acid and base used.
| 5. What are some common examples of acids, bases, and salts? | |
Ans. Some common examples of acids include vinegar (acetic acid), lemon juice (citric acid), and hydrochloric acid. Examples of bases include baking soda (sodium bicarbonate), ammonia, and sodium hydroxide. Common salts include table salt (sodium chloride), Epsom salt (magnesium sulfate), and calcium carbonate.
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