Figure 1 is a diagram of a laboratory device for the production of ammonia. Please answer: (1) The chemical equation for the laboratory preparation of ammonia is ______. (2) The student used tweezers

(1) laboratory preparation of ammonia is the use of ammonium chloride and calcium hydroxide solid heating reaction to generate the chemical equation of the reaction: 2NH4Cl + Ca (OH) 2

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2NH3↑+2H2O+CaCl2,

So the answer is: 2NH4Cl+Ca(OH)2

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? 2NH3↑+2H2O+CaCl2;

(2) Ammonia can make the moist red litmus paper turn blue, use tweezers to clip the moist red litmus paper close to the mouth of the test tube, the phenomenon that can be observed and the conclusion that can be obtained is that the moist red litmus paper turns blue, proving that ammonia was generated,

Therefore, the answer is: moist the red litmus paper turns blue, proving the generation of ammonia;

(3) ammonia is an alkaline gas, can not use acidic desiccant, can not be used in solution, ① soda lime can dry ammonia; ② concentrated sulfuric acid and ammonia can not dry ammonia; ③ sodium hydroxide solution can not be used as a desiccant,

so the answer is: ①;

(4) ① heated ammonia, solution of ammonia monohydrate ammonia decomposition to produce ammonia gas, can be used to prepare ammonia gas, so ① correct;

② solid heating water generated by the backflow of the test tube, so ② error;

③ ammonium bicarbonate thermal decomposition of ammonia, carbon dioxide and water, the ammonia produced is not pure, so ③ error;

The answer is: ② ③;

(5) will be excess ammonia gas into aluminum chloride solution