The scientific name of wheat orchid is Xiangxuelan, and its fragrance is intoxicating when it blooms. Xiaohong planted a pot of wheat orchid on the balcony of her home. She found that her father spri

The scientific name of wheat orchid is Xiangxuelan, and its fragrance is intoxicating when it blooms. Xiaohong planted a pot of wheat orchid on the balcony of her home. She found that her father sprinkled plant ash on the wheat orchid.

Design experimental plan

(1) Take a certain amount of plant ash in a beaker, add an appropriate amount of distilled water, stir, and then filter;

(2) Take Put a small amount of colorless solution in the test tube, and then add a few drops of phenolphthalein test solution. The solution turns red, indicating that the solution is alkaline;

(3) Add dilute hydrochloric acid to the plant ash according to the experimental plan and remove the resulting The gas was passed into the clarified lime water, and the conclusion was drawn that the main component of the plant ash is potassium carbonate. It can be inferred that the purpose of this experiment is to explore that the main component of the plant ash is potassium carbonate. During the experiment, a large number of bubbles can be observed, and the clarified lime water becomes If it is turbid, it can be concluded that the plant ash contains carbonate; when clear lime water is dripped into the potassium carbonate solution, a white precipitate is observed, indicating that a metathesis reaction has occurred in the two solutions. According to the characteristics of the exchange components of the metathesis reaction, potassium carbonate can be judged Reacts with calcium hydroxide to generate calcium carbonate precipitate and potassium hydroxide;

Experimental reflection

(1) The chemical equation of the relevant reaction is ①K2CO3+2?HCl=2?KCl+ H2O+CO2↑? ②Ca(OH)2+CO2=CaCO3↓+H2O;

(2) The aqueous solution of potassium carbonate is alkaline, and ammonium nitrate can react with alkaline substances to generate gas, so it cannot Mixed use;

Answer:

Experimental steps Experimental phenomena Experimental conclusions (1) Filtration (2) Alkaline (3) Dilute hydrochloric acid?

Bubbles

Turn turbid

Is carbon dioxide produced? The main component of plant ash is potassium carbonate. Conjecture (2) Established Experimental Reflection ( 1) ①K2CO3+2?HCl=2?KCl+H2O+CO2↑

②Ca(OH)2+CO2=CaCO3↓+H2O?

(2) No;

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If the aqueous solution of plant ash is alkaline and mixed with ammonium nitrogen fertilizer, ammonia gas will be released and the fertilizer efficiency will be reduced.