write the reaction for the hydrolysis of propionyl propionate (an ester) -- that is, the reaction of this ester with water, yielding a carboxylic acid and an alcohol.
NOTE: here is a general format for ester formation
alcohol + acid - - - > ester + H2O
and here is the general format for the reverse (for hydrolysis of an ester):
ester + H2O - - > alcohol + acid