An organic compound with molecular formula C2H4O2 produces brisk effervescence on addition of sodium carbonate /bicarbonate.
(a)identify the organic compound
(b)Name the gas evolved. How will you test this gas?
(c)Write the chemical equation for the above reaction.
(d) list two important uses of the above compound
Answers
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Given :
An organic compound with molecular formula C2H4O2 produces brisk effervescence(evolution of CO2) on addition of sodium carbonate/bicarbonate.
Then,
(a) The organic compound with the given molecular formula is acetic acid or ethanoic acid.(NOTE : C2H4O2 can be rewritten as CH3COOH)
(b) The gas evolved is carbon dioxide(CO2). To test the gas, pass the gas evolved through "lime water", an aqueous solution of slaked lime[Ca(OH)2]. When you pass this gas(CO2) through the solution it forms a solid percipitate of calcium carbonate(CaCO3). Thus if there is a CO2 present in the sample, the lime water will turn milky, cloudy white.
(c) Chemical equation :
Ca(OH)2 + CO2 --------) CaCO3 + H2O
(d) Acetic acid or Ethanoic acid is used for :
(i) Production of chemical compounds like vinyl acetate
monomer
(ii) Purification of organic compounds
(iii) Medical use
(iv) Food additive
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