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Which two gases can be used for the…

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Which two gases can be used for the demonstration of the fountain experiment?

  • A. SO3 and NH3
  • B. SO2 and NH3
  • C. HCl and NH3
  • D. SO2 and HCl




Fountain experiment is an experimental demonstration of the high solubility of ammonia and hydrogen chloride gas.

In this experiment, a flask containing water is pressured a little so that its water will flow through a pipe into a higher placed flask containing HCl gas or Ammonia gas. Due to the high solubility of these gases, the suction or dissolution pressure will cause the water from the lower flask to keep sprinkling upwards like a fountain even when the initial pressure is removed.

Now for the right answer to the above question:

  1. Option A is incorrect. sulfur trioxide is not soluble enough to cause a fountain sprinkle.
  2. Option B is incorrect. sulfur dioxide too is not quite soluble enough to generate enough pressure that could cause a fountain.
  3. C is correct. In fact, the solubility of ammonia and hydrogen chloride gases is so high that they can absorb water more than 500 times their own volume.
  4. D is not the correct answer.
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You may please note these/this:

  • The higher the solubility of a gas in water, the higher the possibility of it performing a sprinkling fountain.
  • Ammonia and HCl are so soluble that their dissolution pressure causes a fountain to rise out of even a lower placed flask.

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/culled from 2019 JAMB-UTME Chemistry question 36/

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