Acid-Base Indicators Quiz
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Questions and Answers

Which of the following is an acid-base indicator?

  • Vinegar
  • Lime water
  • Turmeric (correct)
  • Baking soda

Turmeric turns red in acidic solutions.

False (B)

What color does turmeric turn when mixed with a basic solution?

Red

Turmeric is a natural indicator and changes color in __________ solutions.

<p>acidic or basic</p> Signup and view all the answers

What substance can Radha use to make the red part of her turmeric-based painting?

<p>Soap solution (A)</p> Signup and view all the answers

Match the following substances with their classifications:

<p>Hydrochloric acid = Acid Sodium hydroxide = Base Sugar solution = Neutral Soap = Base</p> Signup and view all the answers

All indicators will change color when they come into contact with both acids and bases.

<p>False (B)</p> Signup and view all the answers

Which type of solution changes the color of turmeric to yellow?

<p>Acidic solution</p> Signup and view all the answers

Which of the following substances is neutral?

<p>Distilled water (D)</p> Signup and view all the answers

Phenolphthalein changes color in acidic solutions.

<p>False (B)</p> Signup and view all the answers

What is formed as a result of a neutralization reaction?

<p>Salt</p> Signup and view all the answers

The acidic liquid that ants inject when they bite is called _____ acid.

<p>formic</p> Signup and view all the answers

Match the following indicators with their characteristics:

<p>Phenolphthalein = Turns pink in basic solutions Turmeric = Changes to red in basic solutions China rose indicator = Obtained from petals of a flower Litmus = Can be red or blue depending on the solution</p> Signup and view all the answers

What mistake did Ravi make during the experiment?

<p>He added concentrated hydrochloric acid instead of dilute (D)</p> Signup and view all the answers

Organic manure is used to neutralize the basic nature of the soil.

<p>True (A)</p> Signup and view all the answers

Name an artificial indicator.

<p>Phenolphthalein</p> Signup and view all the answers

Which of the following indicates that a chemical change occurred during Soha's experiment?

<p>The test tube got hot. (C)</p> Signup and view all the answers

Neutralization reactions can produce either salt and water or only gas.

<p>False (B)</p> Signup and view all the answers

What products are formed when an acid reacts with a base?

<p>Salt and water</p> Signup and view all the answers

In a neutralization reaction, heat is produced, causing the test tube to become _____.

<p>hot</p> Signup and view all the answers

What does Y represent if the solution turns pink when phenolphthalein is added?

<p>Basic (C)</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Neutralization = The reaction between an acid and a base Indicator = A substance that changes color in acidic or basic solutions Exothermic reaction = A reaction that releases heat Salt = A product formed from the neutralization of an acid and a base</p> Signup and view all the answers

Blue litmus paper turns red in acidic solutions.

<p>True (A)</p> Signup and view all the answers

What is the result of mixing hydrochloric acid with sodium hydroxide?

<p>Sodium chloride and water</p> Signup and view all the answers

Which of the following can be consumed to relieve acidity in the stomach?

<p>Lime water (A), Milk of Magnesia (C)</p> Signup and view all the answers

Phenolphthalein is a natural indicator.

<p>False (B)</p> Signup and view all the answers

What should be added to overly basic soil to improve its quality?

<p>Organic matter</p> Signup and view all the answers

Toothpaste neutralizes the acid produced by the fermentation of food particles due to its ______ nature.

<p>alkaline</p> Signup and view all the answers

What is the main reason for taking an antacid tablet when experiencing acidity?

<p>To neutralize excessive acid (D)</p> Signup and view all the answers

Calamine solution can be used to treat ant stings due to its alkaline properties.

<p>True (A)</p> Signup and view all the answers

Why is hydrochloric acid present inside the human body?

<p>To aid in digestion and prevent microbial diseases.</p> Signup and view all the answers

Match the following substances with their uses:

<p>Hydrochloric acid = Digestion in the stomach Antacid = Relief from acidity Calamine solution = Treatment for ant stings Toothpaste = Neutralization of mouth acid</p> Signup and view all the answers

What is the main cause of the burning pain that Nitesh experienced?

<p>Honeybee sting (A)</p> Signup and view all the answers

Baking soda is a strong acid that can help neutralize other acids.

<p>False (B)</p> Signup and view all the answers

What values do Nitesh's friends demonstrate when they call his mother after he gets stung?

<p>Caring, supportive, and helpful</p> Signup and view all the answers

Rahul remembered his teacher's statement about hydrochloric acid's role in the stomach, which helps in the digestion of __________.

<p>food</p> Signup and view all the answers

Match the following actions with the corresponding reasons:

<p>Nitesh's mother applies baking soda solution = To neutralize the formic acid from the sting Rahul gives his mother baking soda = To relieve pain from excess hydrochloric acid Nitesh's friends call for help = To show support and care for Nitesh Rahul remembers his teacher's lesson = To help his mother with stomach pain</p> Signup and view all the answers

Which acid is responsible for helping us digest food?

<p>Hydrochloric acid (C)</p> Signup and view all the answers

Adding lime to acidic soil will decrease its pH level.

<p>False (B)</p> Signup and view all the answers

What is the likely reason for fish dying in the pond observed by Kishan?

<p>The factory waste was acidic in nature.</p> Signup and view all the answers

The substance 'Y' prescribed for indigestion, which contains magnesium hydroxide, is known as __________.

<p>milk of magnesia</p> Signup and view all the answers

Match the following remedies with their effects:

<p>Soap bath = Neutralizes ant sting pain Quicklime = Increases soil pH Base = Neutralizes acids Milk of magnesia = Relieves indigestion</p> Signup and view all the answers

What can be added to acid waste to neutralize it?

<p>Lime (C)</p> Signup and view all the answers

Using too many fertilizers can lead to acidic soil.

<p>True (A)</p> Signup and view all the answers

What compound is added to neutralize excess acidity in soil?

<p>Quicklime or slaked lime.</p> Signup and view all the answers

Flashcards

Acid-Base Indicator

A substance that changes color in the presence of an acid or a base, indicating whether the solution is acidic or basic.

Turmeric Indicator: Acidic & Basic Colors

Turmeric is a natural indicator. It changes color when exposed to acids or bases. In acidic solutions, it retains its yellow color. In basic solutions, it turns orange-red.

pH Scale

A scale used to measure the acidity or alkalinity of a solution, with 0 being the most acidic and 14 being the most alkaline. A pH of 7 indicates a neutral solution.

Why Turmeric Turns Red in Soap

Turmeric is a natural indicator. It is yellow in color. When it comes in contact with a basic substance, it turns red. This happens because turmeric's chemical structure changes in the presence of a base, causing the color change.

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Identifying Liquids with Turmeric

Turmeric can help distinguish between different liquids based on their acidity and alkalinity. Turmeric will remain yellow in acidic solutions, such as hydrochloric acid. It will turn red in basic solutions, like sodium hydroxide. Sugar solutions are neutral and will not change the color of turmeric.

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Indicator Color Change

The statement ‘If an indicator changes color with a base, it does not change color with an acid’ is incorrect. An indicator will change color with both acids and bases, but the color change will be different for each type of solution.

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Turmeric: Neutral or Not?

Turmeric is a natural indicator that reacts with acids and bases. Therefore, it is not neutral. The reason turmeric changes color is because it reacts with basic solutions.

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Turmeric Stain: Red with Soap

Turmeric is a natural indicator that changes color in the presence of acids and bases. Since soap is basic, it causes the turmeric stain to turn red when washed.

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Neutralization Reaction

A chemical reaction where an acid and a base react to form salt and water. It involves the combination of hydrogen ions (H+) from the acid with hydroxide ions (OH-) from the base.

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Indicator

A substance that changes color in acidic, basic, and neutral solutions. It helps determine the pH of a solution.

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Heat Production in Neutralization

The reaction between an acid and a base releases heat, making the reaction mixture warmer.

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Testing the Nature of a Substance

The process of determining whether a substance is acidic, basic, or neutral.

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Acid

A substance with a pH less than 7. It releases hydrogen ions (H+) in solution.

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Base

A substance with a pH greater than 7. It releases hydroxide ions (OH-) in solution.

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Neutral

A substance with a pH of 7. It is neither acidic nor basic.

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Salt

A chemical compound formed by the reaction of an acid and a base. It is typically ionic in nature.

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Why does a honeybee sting hurt?

A honeybee sting contains formic acid, which is acidic. This acid causes a burning sensation when injected into the skin.

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How does baking soda help a honeybee sting?

Baking soda is a mild base that neutralizes the acidic formic acid in a honeybee sting, providing relief from the burning sensation.

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What causes indigestion?

Our stomachs produce hydrochloric acid, which aids in digestion. However, excessive acid can lead to indigestion, causing pain and discomfort.

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How does baking soda help indigestion?

Baking soda, a mild base, neutralizes excess stomach acid, providing relief from indigestion.

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Why is baking soda a good remedy for indigestion?

Baking soda is a readily available mild base that can neutralize excess acid in the stomach, offering relief from indigestion.

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What are neutral substances?

A neutral substance does not show acidic or basic properties. It has a pH of 7.

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Give an example of an artificial indicator.

Phenolphthalein is an artificial indicator that is colorless in acidic or neutral solutions but turns pink in the presence of a base.

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Name a natural indicator that turns red in a base.

Turmeric is a natural indicator. It stays yellow in acidic solutions and turns orange-red in basic solutions.

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What substance is added to neutralize basic soil?

Organic manure, rich in nutrients, is used to neutralize the basic nature of soil.

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What acid does an ant inject?

Formic acid is the acidic liquid that an ant injects when it bites, causing a burning sensation.

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Which acid helps us digest food?

Hydrochloric acid is present in our stomach, aiding in the digestion of food.

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What is the new substance formed in a neutralization reaction?

Salt is the new substance formed when an acid and a base react in a neutralization reaction.

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Name an indicator obtained from China rose petals.

China rose indicator is obtained from the petals of the China rose flower. It changes color based on the acidity or alkalinity of the solution.

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Indicator (Turmeric example)

A substance that can change color in the presence of an acid or a base, indicating whether the solution is acidic or basic.

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How to treat acidic soil?

The excessive use of fertilizers in fields can make the soil too acidic. Quicklime (calcium oxide) or slaked lime (calcium hydroxide) can be used to neutralize the excess acid and reduce the acidic nature of the soil.

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Neutralizing Factory Waste

The waste from factories can be acidic and harmful to fish. To neutralize the acidic waste, bases like limestone or lime can be added to the water.

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Indigestion Relief

Milk of magnesia (magnesium hydroxide) is a base used to relieve indigestion caused by excess acid in the stomach.

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Lime in Soil

Lime (CaO) is a basic oxide. It's used to raise the pH of acidic soil, making it more suitable for plant growth.

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Ant Bite Remedy

When an ant bites, a basic substance like soap can be used to neutralize the acidic venom, reducing pain.

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Stomach Acid

Hydrochloric acid (HCl), also known as stomach acid, is essential for the digestion of food in the stomach.

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What is the pH scale?

The pH scale measures the acidity or alkalinity (basicity) of a substance. A pH of 0 means it is highly acidic, while a pH of 14 is highly basic. Neutral substances have a pH of 7.

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Why do we take antacids for acidity?

When there's too much acid in your stomach, you have indigestion. Antacids like milk of magnesia help because they are basic and neutralize the excess acid, bringing back balance.

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Why is calamine solution used for ant bites?

When an ant bites, it injects formic acid which makes the skin sting. Applying a base like calamine solution can neutralize the acid and reduce the irritation.

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Why should we avoid lemonade during indigestion?

Lemonade is acidic due to the citric acid in it. Drinking lemonade during indigestion can worsen discomfort since it adds more acid to the stomach.

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Why is hydrochloric acid present in the stomach?

Hydrochloric acid is essential for the body because it aids in digestion by breaking down food particles and killing harmful bacteria. The stomach's environment needs to be acidic for this.

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How does toothpaste help protect teeth?

Toothpaste is alkaline, meaning it's basic. It helps neutralize the acids produced by food particles in the mouth, preventing tooth decay.

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What is quicklime used for in farming?

Quicklime is calcium oxide and is strongly basic. It adds alkalinity to acidic soil to help plants grow better.

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What is a natural indicator?

Indicators are substances that change color depending on whether a solution is acidic or basic. Turmeric is a natural indicator, turning yellow in acidic solutions and reddish-brown in basic solutions.

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Study Notes

Worksheet 3: Turmeric Indicator

  • Acid-base indicator: Turmeric is an acid-base indicator.
  • Turmeric analogy: Turmeric is an indicator, milk of magnesia is a base, baking soda is a base.
  • Turmeric pH determination: You can determine the concentration of acids/bases using a pH scale.
  • Turmeric colour change: Yellow in acid, red/yellow in base.
  • Household item for red pigment: Soap solution/baking soda.

Worksheet 3: Acid-Base Indicator Properties

  • Acid/base colour change: Both acids and bases change the colours of all indicators. However, an indicator only changes colour with one or the other (acid or base), not both.
  • Indicator change colour: Change in colour of an indicator depends on the type of indicator.
  • Turmeric as a natural indicator: Turmeric is a natural indicator, turning orange-red in alkaline solution.

Worksheet 4: China Rose Indicator

  • Natural indicator: China rose petals are a natural indicator for acids and bases.
  • Acidic/basic changes: Turns green in a basic solution, dark pink in acidic conditions and light pink in neutral conditions.
  • Identifying substances: Using China rose indicator, a magenta colour shows a sugar solution, a colourless colour shows lime juice and a green colour shows lime water.

Worksheet 5: pH Value of Acid and Bases

  • Acidity/basicity testing: Fill the table according to observations for different samples regarding pH paper colour and the pH, using pH paper to test the acidity and basicity of substances..

Worksheet 6: Neutralization Reactions

  • Neutralization: The reaction between an acid and a base, forming salt and water.
  • Neutralization reaction observation: When a colourless acid and base solutions are mixed, the resultant solution becomes warm, and no gas bubbles are formed.
  • Neutralization change: The resultant solution is neutral.
  • Acid/base mix observations: When an acid-base is mixed, the substances neutralise each other and are no longer acidic or basic, forming salt and water.

Worksheet 7: Neutralization in Everyday Life

  • Acidity relief: Lime water is a good option for relieving stomach acid.
  • Neutralizing agents: Baking soda (a mild base) is useful to neutralize excess acid in the stomach, providing relief from indigestion.
  • Acidic/basic soil: Adding lime (a base) to acidic soil neutralizes it, which is good for the growth of plants.
  • Acid and base nature of substances: pH value determines the acidity or basicity of substances (pH less than 7 is acid, pH more than 7 is base and pH 7 is neutral)

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Related Documents

Acid Base Worksheets 3, 4, 5, 6 PDF

Description

Test your knowledge on acid-base indicators, their properties, and how they change colors in different solutions. This quiz covers everything from natural indicators like turmeric to artificial ones. Perfect for chemistry enthusiasts and students alike!

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