Podcast
Questions and Answers
Which of the following would be an effective remedy for acidity?
Which of the following would be an effective remedy for acidity?
- Vinegar
- Lemon juice
- Baking soda solution (correct)
- Sugar water
What color does litmus solution turn in an acidic environment?
What color does litmus solution turn in an acidic environment?
- Yellow
- Red (correct)
- Blue
- Green
What is the taste of acids commonly described as?
What is the taste of acids commonly described as?
- Salty
- Sour (correct)
- Sweet
- Bitter
Which natural indicator is derived from lichen?
Which natural indicator is derived from lichen?
Which of the following indicators turns yellow in the presence of a base?
Which of the following indicators turns yellow in the presence of a base?
What happens to red litmus paper in a basic solution?
What happens to red litmus paper in a basic solution?
What type of substances cancel each other's effects?
What type of substances cancel each other's effects?
Which of the following is NOT a natural indicator?
Which of the following is NOT a natural indicator?
What color is the litmus solution when it is neutral?
What color is the litmus solution when it is neutral?
What color does turmeric turn in a basic solution?
What color does turmeric turn in a basic solution?
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Study Notes
Acids and Bases
- Acids give food a sour taste; common examples include citrus fruits.
- Bases exhibit a bitter taste; baking soda is a typical example.
- Baking soda solution can neutralize excess acidity in the stomach.
Properties of Acids and Bases
- Acids change blue litmus paper to red.
- Bases change red litmus paper to blue.
- Turmeric is another natural indicator that changes color based on pH.
Indicators
- Litmus solution is a natural indicator derived from lichen; it appears purple in neutral solutions.
- Red cabbage juice, turmeric, and the petals from flowers like Hydrangea, Petunia, and Geranium can also indicate acidity or alkalinity.
Practical Observations
- Soaps (basic) can turn curry stains reddish-brown on white cloth.
- Rinsing with water restores turmeric’s yellow color, demonstrating the reversible nature of pH changes.
Synthetic Indicators
- Methyl orange and phenolphthalein are examples of synthetic indicators used to test for acids and bases.
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