... powder.Application:The melting point of Vitamin C is 190-192ºC, the Alpha is 20.5 º (c=10,H2O) and the ... resonance structures stabilize the deprotonated conjugate base of Vitamin C, the hydroxyl group in Vitamin C is much more acidic than typical ... described conditions.Keyword:Vitamin C; L-Threo-2,3,4,5,6-Pentahydroxy-1-Hexenoic Acid-4-Lactone Coated Ascorbic Acid(Vitamin C) 97%-USP/BP Standard