Question

Name two gases which can be used in the study of the fountain experiment.
A. Ammonium chloride and hydrogen chloride gas.
B. Ammonia and hydrogen chloride gas.
C. Ammonia gas and chlorine gas.
D. Ammonia gas and hydrogen gas.

Answer 1

Hint: To get the right answer to this problem we need to know that we need the gas which is readily absorbed and is highly soluble in water. Knowing this will solve your problem and will give you the right answers.

Complete step-by-step answer:
If a small volume of water is pumped into the flask, the gas dissolves, producing a lower pressure in the flask, and the water from the trough is drawn into the flask, forming a stream. The guide provides a list of the tools and chemicals required for the experiment, along with teaching tips.
Ammonia is a colorless gas with a characteristically pungent smell. It is lighter than air, with a density of 0.589 times that of air. This is readily liquefied due to heavy hydrogen bonding between molecules; the liquid boils at −33.3 degrees Celsius and freezes to white crystals at −77.7 degrees Celsius.
Hydrogen Chloride is a liquid gas. It can be melted into a colorless liquid at 189K. It's very water-soluble. Hydrochloric acid has a higher dissociation constant and thus is a solid acid. It reacts to different chlorides with metals and salts.

So, the correct answer is Ammonia and hydrogen chloride gas.
Then the correct option is B.

Note – When you get to solve such problems we need to recall the theories of various experiments that we need to learn. The purpose of the fountain experiment is to show that HCI is highly water-soluble. The Fountain technique is used to demonstrate the solubility of the water. Owing to its high solubility, the HCl gas present within the flask dissolves in water. It produces a low pressure inside the container.