Give correctly balanced equation for the laboratory preparation of hydrogen from an alkali.
Answers
In the laboratory, H2 is usually prepared by the reaction of acids on metals such as zinc with Kipp's apparatus. The electrolysis of water is a simple method of producing hydrogen. A low voltage current is run through the water, and gaseous oxygen forms at the anode while gaseous hydrogen forms at the cathode.
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Hydrogen can be obtained in laboratory by the action of dilute sulphuric acid or dilute hydrochloric acid on zinc granules. Take zinc granules in a woulf's bottle and fix a two holed cork. now from one hole fit a thistle funnel and from second hole of cork fix delivery tube. Now add dil.sulphuric acid through thistle funnel.Dil.H2SO4 reacts with zinc to liberate H2 gas. this released gas is collected by downward displacement of water. Dil. H2SO4 + Zn →ZnSO4 +H2 ↑