Question

15 mL of 20% glucose solution is put in a dialysis bag. After 25 mins of immersing the glucose bag in a beaker of water, the new volume of bag is 25 mL. Calculate osmotic pressure.
Formula: Osmotic pressure = iRT(C1-C2)
R = 0.082
T=37oC
Glucose MW = 180g/mole

Answer 1

C1= MASS*1000/(MOLAR MASS* VOLUME) = 20*1000/(180*15) =7.40M

C2=MASS*1000/(MOLAR MASS* VOLUME) = 20*1000/(180*25) =4.44M

OSMATIC PRESSURE = i *T*R *(C1-C2)

                                    = 1*0.0821*310*(7.40-4.44)   

                                   = 75.33 atm

for glucose i=1 for nonelectrlyte like glucose