Question

why is it important that inner tube of condenser is kept cold ​

Answer 1

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When water is allowed to flow into the condenser, it surrounds the inner tube and creates a cooling effect. That way when the vapors from the boiling liquid hit the cool area of the Liebig condenser, they condense back to liquid form, which is how the condenser actually works!

Answer 2

Answer:

when water is allowed to flow into the condenser, it surrounds the inner tube and creates a cooling effect. That way when the vapours from the boiling liquid hit the cool area of the Liebig condenser, the condense back to liquid form.