I have use 7 gr E, 7.5 gr I2, 3.5 gr RP with a flask of 250 ml with a Allihn condenser

I begin the reflux the morning and the stop for the evening I reflux entirely 6 hours per days and I reflux the following day

I noticed that the morning the mixture I became dry must thus add L water !

know this problem?

?

Firstly, you did not tell us how much water you use in the beginning.

Also, since you are doing such a small rxn, it really isn't necessary to stop it at night, it's not so large that watching it would really be all that important.

My point is, that you shouldn't proceed with this stop and go procedure.