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Answer:
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Explanation:
c. Litmus, since it is a natural indicator obtained from the plant lichen.
d. Formic Acid, Since that is the acid that is injected into the skin when an ant bites, which is why it swells. So, we need to add a base( baking soda) to neutralize the acid , and give relief.
e. Pink, as different indicators have different colours in order to differentiate between an acid and a base. Phenolphtalein is colourless in acids and pink in bases.
2. Match the following:
1. Acere- Sour( as it is the latin word for acid which means sour)
2. Lime water- calcium hydroxide( as it is the dilute (which means it is dissolved in water) version of calcium hydroxide. )
3. Anthocyanin- china rose, ( as the petals of china rose are red due to the presence of Anthocyanin in it. )
4.Caustic soda- Sodium hydroxide,( as it is the liquid version of Sodium hydroxide, and it is used for cleaning. )
5.Acetic acid-Vinegar, (as vinegar contains acetic acid. )
6.Methyl Orange - synthetic indicator, as it is an indicator that is madd by humans and is not obtained naturally, thus it is a synthetic indicator. )
3. State whether true or false:
a. True, as acids turn blue litmus paper red, and bases turn blue litmus paper blue.
b. False. They only detect wheter a given substance is acidic or basic.
c. True, a strong acids can burn hands and corrode paper and metal easily, so they should be handled with care.
d. False, this is because phenolphthalein is a synthetic indicator and not a natural one.
4. Find the odd one out.
a. Vinegar, as it is the only acid, rest all are bases.
b. Methyl Orange, as it is the only synthetic indicator, rest all Are organic indicators.
c. Citric acid, as it is the only origanic acid found in citrus fruits like oranges, whereas all others are mineral acids.
5. What do you understand by the term organic acids? name the origanic acids present in curd and vinegar.
ANS. Origanic acids are acids that are obtained naturally from the earth or from a food product. They are very weak acids and dont corrode the skin, and are not corrosive. These are usually weak acids.
origanic acids present in curd and vinegar:
Curd- Lactic acid
Vinegar- Acetic acid.
6. what are mineral acids? give few examples of mineral acids.
Ans. Mineral acids are those that are not obtained naturally from nature. these acids can corrode skin easily, and are usually corrosive , and are strong acids.
For eg: sulfuric acid, hydrochloric acid.
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