Is a plastic bag permeable to iodine or starch?

Why is it not a good idea to store iodine in plastic bag?

The Iodine permeates (passes through) the plastic.

If the tubing was permeable to starch which way would the starch move into the tubing or out of the tubing?

Solutions tend to move from areas of high concentration to areas of low concentration. So if a bag is permeable to starch, the starch will rush into the bag.

How does iodine get in a bag of corn starch?

I am not quite sure what happens when corn starch and iodine are mixed but when corn starch, iodine and water are mixed, it creates a purple solution. The darkness of the colour mostly depends on the iodine. Without the starch with iodine and water, it is deep yellow or brown.

How will you determine whether iodine entered the dialysis bag containing starch?

If iodine enters the bag containing starch, the contents of the bag will turn blue, purple, or black.

Is there a reaction between the ammonium hydroxide inside a plastic bag when immersed in a water with phenolphthalein?

If the phenolphthalein solution turns pink, that means that the plastic bag is permeable to ammonium hydroxide. If it remains colorless, then the plastic bag is not permeable to ammonium hydroxide. If the contents of the plastic bag turn pink, then the plastic bag is permeable to phenolphthalein. If everything remains colorless, then the bag is impermeable to both ammonium hydroxide and phenolphthalein.

Why is not good idea to store iodine in a plastic bag?

Because iodine is an atom and it can permeate the pores of the plastic bag. Iodine can also be very reactive, so storing it in a plastic bag might cause reactions with other substances... depending on what you put near it.

What happens if starch is present in leaf?

The presence of starch in plants indicate that photosynthesis has occurred. The process of testing the presence of starch uses iodine solution that turns to blue-black on a positive test.

Is the cell membrane selectively permeable?

There are different types of plastics and most of them are nor permeable or selectively permeable .Cellophane is a specific plastic used in biological experiments as it is selectively permeable .

If iodine can move through a plastic bag why can't you breathe through a plastic bag?

Well, technically oxygen molecules do move through a plastic bag, just not fast enough for you to use it in a manner that will help you survive.

Why is a plastic bag selectively permeable?

Does not allow matter to pass, but energy (light, heat, etc) is allowed to enter.

What will happen if you pour starch indicator solution into the cell and filled the beaker with starch and glucose solution?

The starch indicator solution will diffuse out of the bag (cell) into the beaker, changing the color of the starch solution to a blue, purple, or black color (assuming that it's iodine). The color of the indicator solution inside the bag will not change, because only the glucose can diffuse into the bag, but the starch cannot diffuse into the bag.

How does iodine stain starch?

Starch is composed of polymers of glucose. Long linear chains are called amylose. Amylopectin is similar but contains a branch point about every 25th glucose or so.Amylose coils into a helical secondary structure resembling a tube with a hollow core. Certain molecules including fatty acids and iodine can lodge inside the core. The complex of iodine lodged inside the amylose tube produces a characteristic blue-black color. The starch itself is not altered, and the staining can be reversed.This is a very sensitive method, used industrially in the starch processing industry, to detect starch and starch fragments. Levels down to 10 ppm can be quantitated using a spectrophotometer to measure A620.However, Iodine is a "metachromatic" stain, meaning it is a single stain that can stain different things different colors. For example: Although Amylose in corn starch stains bluish (actually a sort of blue with a reddish-purple tent), Amylopectin type starches stain a completely different color, sort of a reddish-brown. Tapioca starches stain a more true blue color. Additionally, high amylose type starches stain a shade of pink (when viewed using a polarized microscope, with cross-polarizers in place). Therefore, it is a mistake to think that "all starches" stain a bluish color.Additionally, varying the concentration of the stain, relative to a given amount of starch, can vary the intensity of the staining result. Less stain produces a lighter shade of the expected color, and vice-versa. And the best Iodine stain is actually a blend of Iodine crystals and Potassium Iodide in water.CheapIodine.com is a great source for Iodine.