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Put rock salt, sodium chloride, into a 100 mL filtering flask. Coarse rock salt causes less
frothing than the fine salt. Carefully add concentrated sulphuric acid down the thistle
funnel. You can collect hydrogen chloride gas by upward displacement of air, as in the
diagram.
(i) Collect four test tubes of the gas and cork them. Remove the cork from one of these
test tubes under water. Note the solubility of hydrogen chloride.
(ii) Hold a piece of cotton wool soaked in ammonium hydroxide at the mouth of a test-tube
of hydrogen chloride.
(iii) Shake a test-tube of the gas with water to obtain a solution of hydrogen chloride. Test
the solution with an acid/base indicator. Put a piece of magnesium ribbon in the solution.
Collect any gas formed and test for hydrogen with the glowing splint test.
sharon kalunda answered the question on April 12, 2019 at 07:25
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