Solution:
The pka for caffeine is 10.4 and for ethyl acetate is 25.
Ethyl acetate is a ester, hence its pka is very large.
A zero percent yield means reaction is not taking place. A reaction which is unable to take place gives zero percent yield.
% yield = (Amount of product formed / Theoretical yield) x 100
Thus, amount of product formed will be zero.
what is the pka for caffeine and ethyl acetate? what does a percent yeild of zero...