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Form 1 Chemistry: Acids, Bases and Indicators Questions and Answers
Explain why commercial indicators are preferred to flower extracts as acid-base indicators.
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1.
Study the diagram below and answer the questions that follow. Write an equation for each of the two reactions that take place in the experiment represented by the diagram above.
2.
10g of sodium hydrogen carbonate were dissolved in #200cm^3# of water in a boiling tube. Lemon juice was then added dropwise with shaking until there was no further observable change. (a) Explain the observation which was made in the boiling tube when the reaction was in progress. (b) What observation would have been made if the lemon juice had been added to copper turnings in a boiling tube? Give
3.
The PH of a sample of soil was found to be 5.0. An agricultural officer recommended the addition of calcium oxide in the soil. State two functions of the calcium oxide in the soil.
4.
A student added very dilute sulphuric (VI) acid to four substances and recorded the observations shown in the table below For which test are the observations wrong? Explain.
5.
Starting with red roses, describe how; (i) A solution containing the red pigment may be prepared. (ii) The solution can be shown to be an indicator.
6.
Describe how the PH of antiacid (Actal) powder can be determined in the laboratory.
7.
(a) Name a suitable solvent for extracting an indicator from flowers. (b) Give a reason why the solvent named in (a) above is used.
8.
Explain why commercial indicators are preferred to flower extracts as acid-base indicators.
9.
A farmer intended to plant cabbages in his farm. He first tested PH of the soil and found it to be 3.0. If cabbages do well in alkaline soils, explain the advice that would be given to the farmer.
10.
Given the following substances: wood ash, lemon juice and sodium chloride. (a) Name one commercial indicator that can be used to show whether wood ash, lemon juice and sodium chloride are acidic, basic or neutral. (b) Classify the substances in 9(a) above as acids, bases or neutral..
11.
When a student was stung by a nettle plant, a teacher applied an aqueous solution of ammonia to the affected area of the skin and the student was relieved of pain. Explain.
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