can anyone help me out with my report in our botany laboratory about cell permeability?

Question

materials:
1-cellophane bag (11/2x10)
tissue paper
1-200ml beaker
100ml starch solution
5ml Lugol's solution
string or thread

procedure:
fill the cellophanewith starch solution to about 1inch.tie the open end with string tightly and make sure no air is trapped inside the cellophane.wash the cellophane with starch and be sure that there are no leaks present.ensure that no stach is left from the surface of the bag.wipe excess water with tissue paper.immerse the cellophane bag in a beaker with water enough to cover the height of the cellophane containing starch solution then add 10 drops of Lugol's iodine solution.note thetime it takes until changes are observed on the set-up.

question:
1. what was the color of the iodine solution and starch solution at the beginning of the experiment?
2. what happened to the experiment after a period of time?

Answer 1

Wow! You don't even state your hypothesis. Do you have any idea what may happen?

Iodine turns blue in he presence of starch.

Iodine not in the presence of starch is brown.

What is taking place is osmosis which has a liquid (in this case water) move from high concentration water / low concentration ions to low concentration water / high concentration ions.

So my hypothesis is that water will move from the beaker into the cellophane bag with the iodine and dilute the blue color.

Why don't you test it to see if that works?

Answer 2

it seems to me you dont bother to do the experiment and just want somebody to write down the assignment for you? i think you either should know or you can go and find yourself what the color of iodine solution is and what color it turns when it is added to starch and firure yourself even without doing the experiment, dont you think

it turns blue. you figure out what, where and why