[mollyp]

My professor has asked me to calculate the ascorbic acid (AA) concentration and the methylene blue (MB) concentration using data from 3 experiments (there are 7 total).  These three experiments have varying volumes of 0.1M (AA) and constant volumes of 4 x10^-4 M (MB).  I have already calculated the concentrations for (AA), but shouldn't I use data from other experiments that have varying volumes of (MB) and constant (AA) volumes to find the concentrations for (MB)? 
My professor has specifically asked that I find it from these 3 specific experiments.  Why would she ask me to find the concentration of (MB) for those 3 experiments if they are all the same?

Thanks!
Molly