Questions and Answers
All substances are either acidic or basic.
True
A compound if acidic will turn all indicators red.
False
Lime water turns red litmus blue.
True
Common salt dissolved in water turns blue litmus red.
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Phenolphthalein is a natural indicator.
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Calamine can be used to treat ant's sting.
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Lemon water is basic in nature.
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Is it advisable to give Paheli orange juice for acidity?
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Form a sentence using these words: baking soda, ant bite, moist, effect, neutralised, rubbing.
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Match the substances in Column I with those in Column II.
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Lemon juice and vinegar taste ___ because they contain ___
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All substances are either acidic or basic.
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A compound if acidic will turn all indicators red.
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Lime water turns red litmus blue.
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Common salt dissolved in water turns blue litmus red.
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Phenolphthalein is a natural indicator.
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Calamine can be used to treat an ant's sting.
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Lemon water is basic in nature.
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Is it advisable to give Paheli orange juice for acidity?
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Form a sentence using 'baking soda', 'ant bite', 'moist', 'effect', 'neutralised', 'rubbing'.
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Match the following substances in Column I with those in Column II:
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Lemon juice and vinegar taste ______ because they contain ______.
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All substances are either acidic or basic.
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A compound if acidic will turn all indicators red.
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Lime water turns red litmus blue.
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Common salt dissolved in water turns blue litmus red.
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Phenolphthalein is a natural indicator.
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Calamine can be used to treat an ant's sting.
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Lemon water is basic in nature.
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Is it advisable to give orange juice to Paheli suffering from acidity?
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Form a sentence using the words: baking soda, ant bite, moist, effect, neutralised, rubbing.
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Match the substances in Column I with those in Column II.
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Lemon juice and vinegar taste ______ because they contain ______.
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Study Notes
Acids, Bases & Salts Overview
- Substances can be categorized as acidic, basic, or neutral; not all are exclusively one or the other.
- Acids turn indicators red, while bases turn indicators blue.
- Lime water turns blue litmus paper red, indicating its basic nature.
- Common salt does not affect litmus paper's color when dissolved in water.
- Phenolphthalein is a synthetic indicator, not natural.
- Calamine is effective for treating ant stings due to its soothing properties.
- Lemon water is acidic, not basic.
Indigestion and Remedies
- Orange juice should be avoided for indigestion caused by acidity since it is also acidic, potentially worsening the condition.
Sentence Formation
- Example: "Rubbing baking soda on a moist ant bite neutralised the sting's effect."
Substance Matching
- Tartaric acid - Unripe mangoes
- Calcium hydroxide - Lime water
- Formic acid - Ant's sting
- Sodium hydroxide - Soap
- Lactic acid - Curd
Fill in the Blanks
- Lemon juice and vinegar taste sour because they contain acids.
- Turmeric and litmus are natural acid-base indicators.
- Phenolphthalein gives a pink color with lime water.
- When an acidic solution is mixed with a basic solution, they neutralise each other forming salt and water.
Soil Neutralization
- To remedy acidic or basic soil, the farmer can apply lime (to neutralise acidity) or sulfur (to neutralise alkalinity).
Testing Solution Nature
- To determine the nature of solutions (sugar, baking soda, tamarind, salt), use litmus paper:
- Submerge blue litmus in each solution and observe changes in color, indicating acidity or basicity.
Fish Mortality in Pond
- Fish dying due to pollution from factory waste is likely linked to toxic substances; acidic waste can alter water chemistry.
- To neutralise acidic factory waste, application of a base, like sodium bicarbonate, is recommended.
Neutralisation Reactions
- Everyday examples include:
- Baking soda (base) used to treat acid indigestion (reaction is stomach acid).
- Vinegar (acid) neutralising alkaline cleaning products.
Uses of Litmus Paper
- Litmus paper is a common indicator used to test acidity or basicity of solutions; it turns red in acids and blue in bases.
- Natural colour of litmus paper is purple when neutral.
Toothpaste Properties
- Toothpaste is alkaline to help neutralise acids in the mouth, thus protecting teeth from decay.
Definition of Indicator
- An indicator is a substance that changes color in response to pH shifts.
- Examples of natural indicators include turmeric and red cabbage; synthetic indicators include phenolphthalein and methyl orange.
Neutralisation Reaction Definition
- A neutralisation reaction occurs when an acid reacts with a base to form a salt and water; example: HCl + NaOH → NaCl + H2O.
Differences Between Acids and Bases
- Acids taste sour, bases taste bitter; acids feel sticky, bases feel slippery.
- Acids turn blue litmus red, bases turn red litmus blue.
- Acids release H+ ions in solution, bases release OH- ions.
- Acids react with metals to produce hydrogen, while bases do not.
Litmus in Soft Drinks
- Dipping blue litmus paper in aerated soft drink will turn it red, indicating the drink is acidic.
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Description
Test your understanding of acids, bases, and salts with this quiz that covers their properties, indicators, and common examples. Learn about their role in treating conditions like indigestion and their reactions with indicators. Challenge yourself with matches and fill-in-the-blanks related to various substances.
