Question

Based off of my results, how do I compute the rate of diffusion of the potassium permanganate molecules in millimeters per minute.? And how do I compute the rate of diffusion of the methylene blue molecules in millimeter per minute?

Calculate the diffusion Activity 1: Dye Diffusion Results Diffusion of I Diffusion of methylene blue potassium Time (min) (mm) permanganate (mm) 15 amm | amm I amm 8 mm amm 11mm 18mm 12mm Which dye diffused more rapidly? 2 What is the relationship between molecular weight and rate of molecular movement (diffusion)? Why did the dye molecules move? Ac Iny Compute the rate of diffusion of the potassium permanganate molecules in millimeters per minute (mm/min) and record. Noi The mov mea have mem ing ti mm/min Compute the rate of diffusion of the methylene blue molecules in mm/min and record. due mm/min 1. Re deve 2. O

Answer 1

We have to calculate diffusion per minute for every 15 minute step. And then we have to average this to get average diffusion rate in mm/min.

(6)For methylene blue,

From 15 to 30 min, net diffusion=(2-2)/15 mm/min

= 0 mm/min

From 30 to 45 min, net diffusion=(2-2)/15 mm/min=0 mm/min

From 45 to 60 min, net diffusion=(3-2)/15 mm/min

=0.066 mm/min

So the average rate of diffusion for all three steps in case of methylene blue=(0+0+0.066)/3= 0.022 mm/min(Ans)

(4)Similarly for KMnO4,

From 15 to 30 min, net diffusion= (8-2)/15 mm/min

= 0.40 mm/min

From 30 to 45 min, net diffusion=(11-8)/15 mm/min

=0.20 mm/min

From 45 to 60 min, net diffusion= (12-11)/15 mm/min

= 0.066 mm/min

So the average rate of diffusion for all three steps in case of KmnO4,

=(0.40+0.20+0.066)/3 mm/min

=0.666/3 mm/min

=0.222 mm/min (Ans).

(1) so clearly by comparing the average rate of diffusion we can say that potassium permanganate or KMnO4 has diffused more rapidly.

(2) For two substance 1 and 2,

r1/r2 = √(M2/M1)

Where r1= rate of diffusion of substance 1

r2= rate of diffusion of substance 2.

M2= molecular weight of substance 2.

M1= molecular weight of substance 1