Last seen: Sep 10, 2021
(a) Yes, all basic solutions have H+ ions. They are basic because the concentration of hydrogen ions is much less than that of hydroxide ions. (b) W...
Substances having pH values above 7: Solution of washing soda and toothpaste; They will turn red litmus paper blue due to their basic nature. Substa...
(a) The pH in the stomach of a person suffering from indigestion will be less than 7 since indigestion is caused due to formation of excess acid in th...
(a) pH of pure water = 7 (b) Aqueous solution of sugar will turn the color of universal indicator green because sugar solution is neutral in nature....
1. H+, Cl – 2. H+, NO32- 3. H+, SO42- 4. Na+, OH– 5. K+, OH– 6. Mg2+, OH–
Strong base: A base which completely ionises in water and produces a large amount of hydroxide ions. Weak base: A base which is partially ionised in...
If the soil is too acidic, then it can be treated with materials like quicklime or slaked lime as these materials are bases and hence react with the e...
Our stomach produces hydrochloric acid. If there is excess of hydrochloric acid in the stomach, it causes indigestion which produces pain and irritati...
When the soil is too acidic, it is treated with bases like quicklime or slaked lime or chalk.
(a) The cold drink turns blue litmus red because of its acidic nature. It will have no action on red litmus. (b) A < C < B. B will have maximu...
(a) (i) Acids; A, C and D. (ii) Alkalis; B, E and F. (b) (i)Sulphuric acid. (ii) Sulphuric acid. (iii) Sodium hydroxide. (iv) Nitric acid.
(a) pH of a solution signifies the concentration of hydrogen ions in it. Solution B is highly acidic since it has the lowest pH (pH = 4). (b) Slaked...
(a) Since vinegar is acetic acid so it can’t be used to treat bee sting because bee injects acid into the skin. (b) Since baking soda is basic in n...
(a) When a bee stings a person, it injects an acidic liquid into the skin which causes immense pain and irritation. Its remedy is to rub a mild base l...
(a) Tooth decay starts when the pH of the acid formed in the mouth falls below 5.5 because the acid becomes strong enough to attack the enamel of the ...
(a) Methanoic acid. (b) Methanoic acid The effect of methanoic acid can be neutralised by rubbing a mild base like baking soda solution on the st...
(a) Universal indicator is a mixture of many different indicators which gives different colours at different pH values of the entire pH scale. It is u...
pH value will decrease when milk changes to curd. Curd contains lactic acid hence the pH decreases.
(a) Lower (b) Higher (c) 7 (d) Lower (e) Higher
Alkaline reaction: Solution Y (pH = 8) Acidic reaction: Solution X (pH = 4)