Moist hydrogen reacts with chlorine in diffused sunlight to give out hydrogen chloride. Why is moist hydrogen used? Why not dry hydrogen?

  • $\begingroup$ The choice of moist rather than dry hydrogen seems to be driven by some external circumstances of which we have no idea. Dry hydrogen would react just as well. $\endgroup$ Dec 27, 2017 at 14:37
  • $\begingroup$ The reaction is explosive in direct sunlight. Water acts as a catalyst. $\endgroup$
    – MaxW
    Dec 27, 2017 at 16:36
  • $\begingroup$ Nice video of UV setting off the reacti0n at youtube.com/watch?v=NN82GoBG98s $\endgroup$ Dec 27, 2017 at 23:58

1 Answer 1


H2O has h ions so it adds more + ions so that the cl- gets reacted faster towards the H+ ions so water is a catalysts or booster I hope u understnd


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