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Questions and Answers
What color does litmus paper turn in the presence of an acidic solution?
What color does litmus paper turn in the presence of an acidic solution?
Which of the following indicators remains the same color in a neutral solution?
Which of the following indicators remains the same color in a neutral solution?
Which indicator is known for its sharp color change and is often used in titrations?
Which indicator is known for its sharp color change and is often used in titrations?
What color does phenolphthalein turn in a basic solution?
What color does phenolphthalein turn in a basic solution?
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What happens to an acid indicator when added to a neutral solution?
What happens to an acid indicator when added to a neutral solution?
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Study Notes
Acid Indicators
- Acid indicators are chemical substances that change color in the presence of acids or bases.
- Acid indicators can identify the acidity or basicity of a solution.
- This change in color is due to structural changes in the indicator molecule.
- Indicators are used to identify the acidity or basicity of various solutions.
Identifying Acidic & Basic Solutions
- Acidic solutions cause acid indicators to change to a specific color.
- Basic solutions cause acid indicators to change to a different specific color.
- In a neutral solution, the indicator retains its original color.
Common Acid Indicators
- Litmus paper: turns red in acidic solutions and blue in basic solutions.
- Phenolphthalein: colorless in acidic solutions and pink in basic solutions.
- Methyl orange: red in acidic solutions and yellow in basic solutions.
Using Indicators in Experiments
- To test whether a solution is acidic or basic, a few drops of indicator are added.
- A color change indicates whether the solution is acidic or basic.
- An unchanged color indicates a neutral solution.
Examples Of Acid Indicators
- Litmus: A natural dye from lichens, it changes color with acids and bases.
- Phenolphthalein: A synthetic indicator, useful in titrations due to its distinct color change.
- Methyl orange: Another synthetic indicator that changes color in acid-base reactions.
Importance of Acid Indicators
- Acid indicators are vital tools in chemistry experiments.
- They help determine the pH of solutions.
- This knowledge is essential in medicine, agriculture, and environmental science.
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Description
Test your knowledge on acid indicators with this quiz. Learn how these chemical substances change color in response to different pH levels and identify common indicators used in experiments. Explore the effects of acidic, basic, and neutral solutions on these indicators.
