Why is the test tube in which the mixture of calcium hydroxide and ammonium chloride is heated to obtain ammonia, with the stopper slightly downward? What happens if this tube is corked up and heated?
Ca (OH) 2 + 2NH4Cl -> CaCl2 + 2NH3 + 2H2O
During the reaction of obtaining ammonia, water is released so that ammonia does not dissolve in it, the test tube is slightly tilted with the cork down so that the water flows to the cork.
If the tube is placed with the stopper up and heated, then the formed ammonia will dissolve in the released water, and we will not be able to collect it.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.