Question

3. (a) Name the impurities present in hydrogen prepared in
the laboratory
b) How can these impurities be removed.​

Answer 1

a)hydrogen sulphide,sulphur dioxide,oxides of nitrogen,phosphine,arsine,carbon dioxide and water vapour are the impurities present in the hydrogen prepared in laboratory.

b)the impurities can be removed from hydrogen by passing it through

1)silver nitrate solution to remove arsine and phosphine

AsH3+6Ag3As

3AgNo3+3HNO3

PH3+6AgNO3----->Ag3P+3AgNO3+3HNo3

2)lead nitrate solution to remove hydrogen sulphide

Pb[No3]2+H2S ----->PbS+2HNO3

3)caustic potash solution to remove sulphur dioxide,carbon dioxide and oxides of nitrogen

SO2+2KOH----->K2SO3+H2O

CO2+2KOH------>K2SO3+KNO3+H2O

4)A dry agent used to dry the gas common drying agents such as fused calcium chloride,caustic potash stick and phosphorus remove water vapour

so,the gas is purified and dried and then collected over mercury because mercury does not react with it.

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Answer 2

Question-

How can the impurities present in hydrogen prepared in the laboratory be removed?

Answer-

The impurities present in hydrogen prepared in the laboratory are as follows-

• Hydrogen Sulphide
• Sulphur Dioxide
• Oxides Of Nitrogen
• Phosphine (PH₃)
• Carbon Dioxide
• Water Vapour

Crude hydrogen gas containing carbon dioxide and hydrogen sulfide impurities are scrubbed with aqueous liquid triethanolamine solution (C₆H₁₅NO₃) to remove the impurities from the hydrogen gas.

Triethanolamine, or TEA is a viscous organic compound that is both a tertiary amine and a triol. A triol is a molecule with three alcohol groups.