Guys revising Phy Chem today. So lets drop the most imp (common or niche) formulas or concepts u guys know.
I'll start.
buffer capacity can be given by 2.303 as/a+s where a and s are conc of acid and conjugate base.
delG = VdP - SdT
Cyclisation reduces entropy while racemization inc it.
Azeotropic mixture is the condensate for min B pt and the residue for max bpt wale.