WHICH TWO GASES CAN BE USED FOR THE DEMONSTRATION OF THE FOUNTAIN EXPERIMENT
- A. SO4 and NH3
- B. SO3 and NH3
- C. HCl and NH3 ✓
- D. SO2 and CO
The answer to the question is: C. HCl and NH3
The two gases that can be used for the demonstration of the fountain experiment are option C: HCl and NH3. This experiment is a classic demonstration of gas behavior and is often used in educational settings to illustrate principles of chemistry.
In the fountain experiment, a flask containing ammonia (NH3) is connected to a second flask containing hydrogen chloride (HCl) through a stopcock. When the stopcock is opened, the two gases mix and react to form a white cloud of ammonium chloride (NH4Cl) particles. The reaction is exothermic, meaning it releases heat, and the resulting gas expands rapidly, creating a “fountain” effect as it pushes out of the flask.
The reaction between ammonia and hydrogen chloride can be represented by the following chemical equation:
NH3(g) + HCl(g) → NH4Cl(s)
This reaction produces solid ammonium chloride from the gaseous ammonia and hydrogen chloride. The white cloud that forms is composed of tiny particles of ammonium chloride, which are visible as they disperse in the air.
The fountain experiment is a striking visual demonstration of several important chemical concepts, including gas behavior, chemical reactions, and the formation of solid products from gaseous reactants.
