How will you prove that hydrochloric acid contains hydrogen chlorine?

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Chemistry | Class 10 | ICSE | Selina | Study of Compounds – Hydrogen Chloride

How will you prove that hydrochloric acid contains hydrogen chlorine?

Solution:

The following experiment can be used to demonstrate that hydrochloric acid contains both hydrogen and chlorine.
Step 1: Prepare a voltameter for water electrolysis with a platinum cathode and a graphite anode.
Step 2: Fill the voltameter with 4 molar HCl and measure direct current.
Step 3: Allow the reaction to take place without disturbing the device. At the cathode, a colourless gas is produced, whereas, at the anode, a greenish gas is produced.

Step 4: Bring the burning splinter closer to the colourless gas, and it will explode into flame, indicating that the evolved gas is hydrogen.

Step 5: When you apply wet starch iodide paper to the greenish-yellow gas, it turns blue-black, suggesting that the developed gas is chlorine.

As a result of this experiment, hydrochloric acid includes both hydrogen and chlorine. For this experiment, the equation is

2HCl – ^>500°c→ H₂ + Cl₂

i

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