Animated video: 37 principles of chemical reactions and their dangers—artificial smoke
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Principle: Concentrated hydrochloric acid and concentrated ammonia water are pre-dropped at different locations on the paper sheet. Both of these substances are highly volatile, and when they come into contact in the air, they form ammonium chloride, creating a smoking effect. Fun fact: Another common demonstration experiment, the “ammonia fountain,” shows the high solubility of this gas in water. When the ammonia gas in the bottle comes into contact with water containing phenolphthalein, it dissolves rapidly, resulting in a decrease in pressure inside the bottle and the formation of a pink suction fountain: Risk: Low. However, concentrated hydrochloric acid and concentrated ammonia are irritating; it is necessary to ensure good ventilation to avoid inhalation. Recorder: NightHawkInLight
Hazard: Low. However, concentrated hydrochloric acid and concentrated ammonia are irritating; it is necessary to ensure good ventilation to avoid inhalation.