Acids, Bases-12 PDF
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This document discusses nature's neutralization options, specifically focusing on stinging nettles and their associated acids/remedies. It presents a table of naturally occurring acids, along with questions related to solutions, concentration, and the nature of solutions.
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Do You Know? Nature provides neutralisation options Nettle is a herbaceous plant which grows in the wild. Its leaves have stinging hair, which cause painful stings when touched accidentally. This is due to the methanoic...
Do You Know? Nature provides neutralisation options Nettle is a herbaceous plant which grows in the wild. Its leaves have stinging hair, which cause painful stings when touched accidentally. This is due to the methanoic acid secreted by them. A traditional remedy is rubbing the area with the leaf of the dock plant, which often grows beside the nettle in the wild. Can you guess the nature of the dock plant? So next time you know what to look out for if you accidentally touch a nettle plant while trekking. Are you aware of any other effective traditional remedies for such stings? Table 2.3 Some naturally occurring acids Natural source Acid Natural source Acid Vinegar Acetic acid Sour milk (Curd) Lactic acid Orange Citric acid Lemon Citric acid Tamarind Tartaric acid Ant sting Methanoic acid Tomato Oxalic acid Nettle sting Methanoic acid Q U E S T I O N S 1. You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? ? Which of this is acidic and which one is basic? 2. What effect does the concentration of H+(aq) ions have on the nature of the solution? 3. Do basic solutions also have H+(aq) ions? If yes, then why are these basic? 4. Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)? 2.4 MORE ABOUT SAL SALTS TS In the previous sections we have seen the formation of salts during various reactions. Let us understand more about their preparation, properties and uses. 2.4.1 Family of Salts Activity 2.13 n Write the chemical formulae of the salts given below. Potassium sulphate, sodium sulphate, calcium sulphate, magnesium sulphate, copper sulphate, sodium chloride, sodium nitrate, sodium carbonate and ammonium chloride. 28 Science 2024-25
