Podcast
Questions and Answers
Which of the following tastes sour?
Which of the following tastes sour?
Baking soda tastes sour.
Baking soda tastes sour.
False
What is the taste of baking soda?
What is the taste of baking soda?
bitter
Turmeric and litmus are examples of ________.
Turmeric and litmus are examples of ________.
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What happens to litmus in an acidic solution?
What happens to litmus in an acidic solution?
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Which of the following is a source of acetic acid?
Which of the following is a source of acetic acid?
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Match the following acids with their sources:
Match the following acids with their sources:
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The word acid comes from the Latin word ________ which means sour.
The word acid comes from the Latin word ________ which means sour.
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What is the primary use of indicators?
What is the primary use of indicators?
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Study Notes
Acids and Bases
- Many everyday substances like lemon, tamarind, and vinegar taste sour due to the presence of acids.
- Acids are substances with a sour taste; the word "acid" comes from the Latin word "acere," meaning sour. Examples include acetic acid (vinegar), formic acid (ant stings), citric acid (citrus fruits), lactic acid (curd), oxalic acid (spinach), ascorbic acid (Vitamin C), and tartaric acid (tamarind, grapes).
- Bases are substances that taste bitter and feel soapy. Examples include baking soda, calcium hydroxide (limewater), ammonium hydroxide (window cleaner), sodium/potassium hydroxide (soap), and magnesium hydroxide (milk of magnesia).
- Indicators are substances used to identify whether a material is acidic or basic; they change color in the presence of acids or bases.
Natural Indicators
- Litmus is a common natural indicator extracted from lichens.
- Litmus paper (red and blue) changes color depending on the solution's acidity or basicity: red litmus turns blue in a base, and blue litmus turns red in an acid.
- Other natural indicators include turmeric and China rose petals.
Safety Precautions
- Do not taste or touch any substance unless instructed to do so.
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Description
Explore the fascinating world of acids and bases through everyday substances. Learn about their properties, examples, and the role of indicators like litmus. This quiz provides a comprehensive look at how acids and bases affect our daily lives.
