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Glacial acetic acid is obtained by...

Glacial acetic acid is obtained by

A

chemically separaing acetic acid

B

treating vinegar with dehydrating agents

C

crystallising, separaing and melting acetic acid

D

distilling vinegar

Text Solution

Verified by Experts

The correct Answer is:
A
The glacial acetic acid is made by fractional distillation. The pyroligneous acid is neutralised with milk of lime, methyl alcohol and acetone are distilled off- the solution of calcium acetate is then evaporated to dryness. The dry calcium acetate is distilled with concentrated sulphuric acid-the distillate contain about 50% of acetic acid. `(CH_(3)CO O)_(2)Ca+H_(2)SO_(4)=CaSO_(4)+2CH_(3)CO OH`. This is neutralised with caustic soda, and the solution is evaporated to dryness. the dry sodium acetate thus formed on distillation with concentrated `H_(2)SO_(4)` gives a distillate of glacial acetic acid. `2CH_(3)COONa+H_(2)SO_(4)=2CH_(3)COOH+Na_(2)SO_(4)`. Any water still present is removed by cooling the acid in ice, when pure acetic acid alone solidifies as colourless ice like (glacial) mass, and hence the name glacial acetic acid.
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Knowledge Check

  • Acetic acid is obtained when :

    A
    glycerol is heated with conc . `H_(2)SO_(4)`
    B
    acetaldehyde is oxidised with `K_(2)Cr_(2)O_(7)andH_(2)SO_(4)`
    C
    calcium acetate is distilled in the presence of calcium formate
    D
    methyl alcohol is oxidised with `KMnO_(4) andH_(2)SO_(4)`.

  • HClO_4 ,HNO_3 and HCl are all very strong acid in aqueous solution .in glacial acetic acid medium their acid strength is such that

    A
    `HClO_4 gt HNO_3 gt HCl`
    B
    `HNO_3 gt HClO_4 gt HCl`
    C
    `HCl gt HClO_4 gt HNO_3`
    D
    `HClgt HClO_4=HNO_3`

  • Acetic anhydride is obtained by the reaction of :

    A
    acetic acid and sodium
    B
    acetic acid and water
    C
    acetic acid and ethyl alcohol
    D
    acetic acid and `P_(2)O_(5)`.