1. The problem statement, all variables and given/known data I am trying to calculate Mv as part of a lab using GPC data for a polystyrene polymer that I produced with a known polystyrene standard. for the produced PS I have a = .678 and K = .00018 and the standard has a = .725 and K = .011. intrinsic viscosity was measured as .2346 Mn for the polymer from GPC is 23097 g/mol (for reference) The solvent is THF, I'm not sure if the GPC is conventionally or universally calibrated 2. Relevant equations IV (eta) = K*Mv^a (Mark–Houwink-Sakurada equation) ln (Mv) (of PS produced) = 1/(asa + 1) * ln (Kst/Ksa) + (ast + 1) / (asa + 1) * ln (Mvst) (sa = produced sample, st = standard) (equation correcting for GPC universal calibration) 3. The attempt at a solution I used the Mark–Houwink-Sakurada equation and got Mv = 68.08 for the standard I then used the below equation to solve for my sample and got Mv = 880.62 I am confused as to why this number is so much lower than the Mn or Mw. Is this normal or am I using the wrong procedure or equation to calculate this value?