hmm any diffusion experts willing to help?

[CrazCo]

TDS?

 

Questions + Guessssses ! Could ya tell me which ones are right and correct those that are wrong?

 

3 experiements:

 

1) Place molasses in dialysis tubing and put it into a beaker of water (label beaker A)

2) Place Starch in dialysis tubing and put it into a beaker of water and an iodine solution. (label beaker B)

3) Place starch in dialysis tubing and put it into a beaker of glucose and water. (label beaker C)

 

Questions + Guesses.

 

1) A 5 percent solution of molasses is place in a beaker filled with a 10 percent one. What happens? How come?

 

Nothing happens because the molasses is unable to diffuse across the 'membrane'

 

2) List and describe the changes occuring in beaker A.

Diffusion of water into the dialysis tubing until equilibrium is reachedddd (any color changes? or any affects occur to the molasses?)

 

3) List and describe the changes occuring in beaker B after 20 minutes.

Iodine and water diffuse into dialysis. 20 mins is not enough time to reach equilibrium but the starch would turn a dark blue color due to the iodine

 

4) List and describe the changes occuring in beaker C.

The glucose and water would diffuse until equilibrium is reached (any color changes though? or anything else notable?

 

5) If you waited 24 hours how would the results of beaker b change? How come?

Equilibrium would be reache and the starch would become darker.

 

6) Of molasses, starch, glucose, water, salt and iodine which pass through the membrane easily? slowly? not at all?

 

Easily: Water and iodine

Slowly: Glucose

Not at all: Molasses, Salt and Starch

 

Thanks in advance

 

buh byeee

[thedarkshade]

Nothing happens because the molasses is unable to diffuse across the 'membrane'

First, when molecules move from a place with higher concentration to a place with lower concentration through a membrane that's called osmosis (a kind of diffusion). The case of being able to move or not being able to move through membrane, depends on the permeability of the membranes pores. e.g. The pores of our cell's membrane can let in molecules with molar mass up to 100g/mol. Now if you know the permeability of the pores, and the molar mass of the substance tending to go through the pores, then you can conclude if they are able or not to move through the membrane!

 

As for the other questions, I'll have to do the experiments myself so I could possibly help you CC, but due to my limited leisure time, I think I really won't be able to!

 

Cheers!

[CrazCo]

Merciiiiiiiiiiiiiiii!