Please describe the lab preparation of hydrogen.

In a Woulf's Bottle; fitted with Thistle funnel and delivery tube, take few grams of granulated Zinc. Pour dil. H2SO4over the granulated Zinc through Thistle funnel. Dil. H2SO4reacts with Zinc to liberate H2gas, as shown in the reaction below:

dil. H2SO4+ Zn > ZnSO4+ H2(gas)

Collect the liberated H2gas in an inverted tube placed in shelf containing water as shown in the fig.

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Take 5 g zinc in a conical flask and fix a two-holed air tight stopper in the mouth of the flask. Through one hole, pass a thistle funnel, and through the other hole, pass a delivery tube whose other end is dipped in a water trough. Over the other end, place a beehive shelf.

Pour 2 cc of copper sulphate solution through the thistle funnel, and then dilute sulphuric acid, so that the lower end of the thistle funnel is completely immersed. Then, a reaction takes place between zinc and sulphuric acid, with the evolution of hydrogen gas. Here, the copper sulphate solution acts as a catalyst. The evolved hydrogen gas bubbles through water. The first few bubbles contain air, so allow them to escape. Then, invert a gas jar completely filled with water over the beehive shelf. The hydrogen gas produced collects in the gas jar by displacing water.

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