ACIDS USED IN OUR DAILY LIFE
ACIDS
- During summer, when your grandmother prepares pickles ( line, mango etc.). she adds vinegar to them. Did you ever ask her why she does that if not, ask her now and find out the reason.
- Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic.
- The word 'acid' comes from the Latin word 'acidus' which means sour.
- We come across many acids in our daily life. In general, acids are chemicals substances which contain replaceable hydrogen atoms.
- Acids can be classified into two categories namely organic acids and mineral acids or inorganic acids. ORGANIC ACIDS:
- Acids which are obtained from animal and plant material are called organic acids.
- Many such acids are found in nature. Lemon and orange contain "CITRIC ACID". Hence they are called citrus fruits.
- Milk that has turned to curd tastes sour, contains an acid called "LACTIC ACID". the acids found in foodstuff are weak.
- Soft drinks contain some carbonic acid which gives a tingling taste. Apple contains "MALIC ACID". MINERAL ACIDS:
- Acids that are obtained from minerals are called mineral acids or inorganic acids. For examples, Hydrochloric acid (HCl), Nitric acid (HNO3), Sulphuric acid (H2which are commonly available in the laboratory.
- They must be handled with a lot of care. They are corrosive. It means that they can eat away metal, skin and clothes.
- But they will not corrode glass and ceramic. Hence they are stored in glass bottles. An acid is a substance which contains replaceable hydrogen ions.
| 
vinegar | 
acetic acid | 
| 
apple | 
malic acid | 
| 
ant | 
formic acid | 
| 
milk | 
lactic acid | 
| 
grapes | 
tartaric acid | 
| 
tomato | 
oxalic acid | 
| 
lemon | 
citric acid | 


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