Preparation of Dihydrogen
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Transcript of Preparation of Dihydrogen
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1.Laboratory preparation of Dihydrogen. 2.Commercial production of Dihydrogen.
Preparation of Dihydrogen.
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1. Laboratory preparation of Dihydrogen
i. It is prepared by the reaction of granulated zinc
with dilute hydrochloric acid.
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Ex: Zn +HCl ZnCl2+H2
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ii. Other laboratory method is by the
action of metals like Zn, Al on strong alkalis
like NaOH or KOH
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Ex:Zn+2NaOH Na2ZnO2+H2
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2.Commercial production of Dihydrogen
i.Treat a ribbon of Mg with dilute H2SO4
Mg(s)+dil H2SO4 MgSO4(aq)+H2(g)
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ii. Pure Dihydrogen can also be produced by electrolyzing a warm solution of Ba(OH)2
using inert electrodes.
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iii. Also by oxidation of NaH by water.
NaH+H2O NaOH +H2
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The mixture of carbon monoxide and hydrogen is called water gas. (Co+H2)
Water gas.
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Water gas is used in the preparation of
methanol and other hydrocarbons. Water
gas is also called syngas or synthesis
gas
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The process of producing syngas from coal is called coal gasification. C(s) +H2O(g) Co(g) +H2(g)
Coal gasification
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Water gas shift reaction. When carbon monoxide of syngas mixtures react with steam in the presence of iron chromate as catalyst, the production of Dihydrogen increases.
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CO+H2O(g) CO2(g)+H2(g)
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