Write preparation of ethanoic acid.Answer the given question in brief.
Answers
Preparation
Put a few anti-bumping granules and 10 cm3
of
dilute sulfuric acid in the
round bottomed or pear
shaped flask.
In a fume cupboard, add in
9 g of sodium dichromate
and dissolve by careful
swirling. Use a small dry
funnel to avoid crystals of
dichromate being caught
on the neck of the flask.
Mop up any spilt drops as
sodium
dichromate
solution is highly irritating
to the skin and eyes, and
may also cause damage to
clothes and the work
surface.
Slowly with swirling and cooling in an ice bath, ad
d 6 cm
3
of
concentrated sulfuric acid. Set up the apparatus as
shown in Fig. 1 for
reflux distillation with addition. If necessary, us
e a clamp to hold the
water outlet in the sink.
Mix 2 cm
3
of ethanol and 10 cm
3
of deionised water in the dropping
funnel. Add the solution from the dropping funnel
dropwise
down the
condenser, while swirling the contents of the flask
and cooling it if
necessary to prevent too vigorous a reaction.
Remove the dropping funnel and still head from the
top of the
assembled apparatus. Boil the mixture gently using
a water-bath for
about half an hour.
Cool the apparatus; dismantle and rearrange for dis
tillation as in Fig. 2.
Direct heating without a water bath must be used, as the boiling point of the mixture will eventually exceed 100 0C.Distil off about 15 cm3.This is aqueous ethanoic acid.