5. Is the meaning of 'weak acid' the same as that of 'dilute acid'?
6. State the differences between acids and bases.
7. Three liquids are given to you. One is hydrochloric acid; another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.
8. A farmer was unhappy because of his low crop yield. He discussed the problem with an agricultural scientist and realised that the soil of his field was either too acidic or too basic. What remedy would you suggest the farmer to neutralise the soil?
Answers
Explanation:
The key difference between weak acid and dilute acid is that weak acid is a compound that partially dissociates when dissolved in water, whereas dilute acid is a solution containing more water than acid
2) Turmeric solution turns red in contact with bases and is not affected by acids and neutral substances. Put one drop of each liquid as the turmeric paper. The liquid whose drop turns the paper red is solution hydroxide (base).
Now, this red turmeric paper may be used to identify which one of the remaining two liquids is hydrochloric acid. Put one drop of each of these remaining liquid on the red turmeric paper. The liquid whose drop will turn this red paper yellow is hydrochloric acid. This colour changes from red to yellow because hydrochloric acid neutralizes the pH effect of sodium hydroxide on turmeric paper.
There is no effect on turmeric solution by sugar solution.
3) When the soil of his field is so acidic, it is to be treated with bases like slaked lime(calcium hydroxide) or quicklime(calcium oxide).
The organic matters are added to soil, if the soil of his field is so basic. Organic matter releases acids that neutralise the basic nature of the soil.
@ngel...
