Synthesis Of Benzocaine Lab Need Help With "synthesis Of Benzocaine" Lab?

Need help with "synthesis of benzocaine" lab? - synthesis of benzocaine lab

I need to brief comments on this laboratory (eg, color changes, change emissions of greenhouse gases and the exothermic heat).

*** This is what I have so far ..
There have been extensive changes in the gas (foam), which was visible after the solution of sodium carbonate was added to the reaction.

Was there a color change or something like that? Who did this lab and I can help, it would be really great!