A teacher separated a mixture of two liquids using the apparatus shown. The liquids were:
• ethanoic acid, boiling point 118 °C,
• chloroethanoic acid, boiling point 190 °C.
(a) Complete the boxes to label the pieces of apparatus used.
(b) (i) Which liquid would be collected first? Explain why.
(ii) How would the teacher know when all of this liquid had been collected?
(c) Suggest why small glass beads are used in the fractionating column instead of large glass beads.
(d) Give a test to show that the liquids are acidic.
test.................................................................................................................................
result.............................................................................................................................
• ethanoic acid, boiling point 118 °C,
• chloroethanoic acid, boiling point 190 °C.
(a) Complete the boxes to label the pieces of apparatus used.
(b) (i) Which liquid would be collected first? Explain why.
(ii) How would the teacher know when all of this liquid had been collected?
(c) Suggest why small glass beads are used in the fractionating column instead of large glass beads.
(d) Give a test to show that the liquids are acidic.
test.................................................................................................................................
result.............................................................................................................................
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Answer:
b) (i) ethanoic acid will be collected first as it has lower boiling point 118°C
(ii) when the temperature starts growing above 118°C
Teacher will come to know that all this liquid has been collected.
d) litmus tests
Blue litmus will turn Red