HCl is very soluble in water, whereas Cl2 is only slightly soluble in water. Both gases can be dried using concentrated sulfuric acid.
Which diagram represents the correct method of obtaining pure dry Cl2 from a mixture of damp Cl2 and HCl?
Answer: B
- For a gas to be passed through a solution/ drying agent, the in-tube must be submerged into the solution → C and D shows an incorrect setup.
- In the correct setup (B), the mixture of gases is passed into water → HCl is dissolved and only Cl2 is passed into the 2nd tube.
In the 2nd tube, damp Cl2 is passed into conc. sulfuric acid (drying agent) → water is removed and dry Cl2 is obtained.
- Setup in A is erroneous as the gas after drying with conc. sulfuric acid is passed into water again.
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