Question 15 Marks
How will you prove that Hydrochloric acid contains (i) Hydrogen (ii) Chlorine?
Write equations for the reactions.
Write equations for the reactions.
Answer
View full question & answer→We can prove that hydrochloric acid contains both hydrogen and chlorine by the following experiment.
Take a voltameter used for electrolysis of water, fitted with the platinum cathode and a graphite anode.
Into the voltameter pour 4 molar $HCl$ and pass direct current.
It is seen that a colourless gas is evolved at the cathode and a greenish gas is evolved at the anode. When a burning splinter is brought near a colorless gas, it bursts into a flame thereby proving that it is hydrogen gas.
When moist starch iodide paper is held in the greenish-yellow gas, it turns blue-black, thereby proving that the gas is chlorine.
$
2 HCl \rightarrow H _2+ Cl _2
$
This experiment proves that hydrochloric acid contains both hydrogen and chlorine.
Take a voltameter used for electrolysis of water, fitted with the platinum cathode and a graphite anode.
Into the voltameter pour 4 molar $HCl$ and pass direct current.
It is seen that a colourless gas is evolved at the cathode and a greenish gas is evolved at the anode. When a burning splinter is brought near a colorless gas, it bursts into a flame thereby proving that it is hydrogen gas.
When moist starch iodide paper is held in the greenish-yellow gas, it turns blue-black, thereby proving that the gas is chlorine.
$
2 HCl \rightarrow H _2+ Cl _2
$
This experiment proves that hydrochloric acid contains both hydrogen and chlorine.
