Class 7 Acids Bases and Salts Notes for exams

Class 7 Acids Bases and Salts Notes for exams. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations.  Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.

Smart Notes

Substances may be classified as-

● Acid

● Bases

● Salts

Acids-

● Taste sour

● Contain replaceable hydrogen radical

● May be organic or mineral

● Turn blue litmus red

● Some commonly found acids are- Hydrochloric acid, nitric acid, sulphuric acid, acetic acid, lactic acid, citric acid etc

Mineral and organic acids-

● Mineral acids are found in nature in rocks.

● Are strong

Common mineral acids- Hydrochloric acid, nitric acid, sulphuric acid

* Acids must NOT be tasted to identify.

Organic acids-

● Are found in plants and animals

● Are weak acids.

Common organic acids are Acetic acid(vinegar), Lactic acid(in milk and curd, formic acid(in ant sting), citric acid(in citrus fruits like lemon and orange), oxalic acid(in spinach), ascorbic acid(in citrus fruits and amla), tartaric acid(in tamarind, grapes, unripe mangoes etc.)

Bases-

● Are bitter to taste

● Are soapy to touch

● Contain replaceable hydroxide radical

● Turn red litmus blue

● Turn phenolphthalein pink

Common bases are sodium and potassium hydroxide (used in making soap), magnesium hydroxide(milk of magnesia), ammonium hydroxide(used as window cleaner), calcium hydroxide(lime water)

Please click the link below to download Class 7 Acids Bases and Salts Notes for exams.