10 Questions
What is the chemical nature of curd, lemon juice, orange juice, and vinegar?
Sour
Why do substances like curd, lemon juice, orange juice, and vinegar taste sour?
Because they contain natural acids
What is the taste of baking soda?
Bitter
What is the chemical nature of substances that are bitter in taste and feel soapy on touching?
Basic
What does the word 'acid' come from?
Latin word meaning sour
What is the purpose of using indicators in chemistry?
To identify whether a substance is acidic or basic
Which is the most commonly used natural indicator in the text?
Litmus
What happens to litmus paper when added to an acidic solution?
It turns red
Why should we not taste unknown substances according to the text?
They could harm us
What are substances that do not change the color of either red or blue litmus known as?
Neutral solutions
Study Notes
Acidity and Basicity
- Curd, lemon juice, orange juice, and vinegar are acidic in nature due to the presence of acids such as lactic acid, citric acid, ascorbic acid, and acetic acid, respectively.
- These substances taste sour because they contain acids that stimulate the sour taste buds on the tongue.
Bases
- Baking soda has a bitter taste and feels soapy to the touch due to its basic nature.
Acidic and Basic Substances
- Substances that are bitter in taste and feel soapy on touching are usually basic in nature.
- The word 'acid' originates from the Latin word 'acidus,' meaning sour.
Indicators in Chemistry
- Indicators are used in chemistry to determine whether a substance is acidic or basic.
- Litmus is the most commonly used natural indicator, which turns red in acidic solutions and blue in basic solutions.
- When litmus paper is added to an acidic solution, it turns red, and when added to a basic solution, it turns blue.
Safety Precautions
- It is not recommended to taste unknown substances because they may be harmful or even toxic.
Neutral Substances
- Substances that do not change the color of either red or blue litmus are known as neutral substances.
Test your knowledge of tastes of edible substances like lemon juice, orange juice, vinegar, curd, and tamarind with this quiz. Enter the taste of each substance as described in Table 4.1. Remember to exercise caution and not taste or touch anything unless asked to do so.
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