I would really appreciate help.
QUESTION
-
One of the students was in a hurry to finish
and filtered his solution in step 4 before it had cooled down
properly.Explain why this resulted in him obtaining a low
yield.
I'm really unsure please help.
Hydrolsis
ester - PROCEDURE
1.Add 2cm3 of
methylbenzoate flask, record mass
Add 10cm3
dilute 2.0moldm-3 NaOH solution (in excess), about 10cm3 of ethanol
and anti bump granules. fit the water condesner on
2. heat flask
gently without allowing contents to boil for about 5 min. and then
boil gently under reflex for futher 15 min
3. allow
contents flask to cool remove condenser and decant solution from
antibump graniles into a beaker. add 10 drops methyl orange
indicator and acidify with 2.0 moldm-3 HCl. filter product under
reduced pressure
4.
recrstyallise product - dissolve solid in minim amount of boiling
water to allow to cool slowly, when cool filter purified product
under reduced pressure and allow dry in air on filter
paper
5. dry sample
of product by pressing between filter papers and determine mpt
(which is greater than 100 degrees) record value
6. weigh dry
product and record mass