Question

question
how are you going to determine if iodine and/or starch diffuse across the dialysis tubing?
select all of the correct statements.
a. if only iodine is able to diffuse across the membrane, the solution in the dialysis tubing bag will look dark purple.
b. if only starch is able to diffuse across the membrane, the solution in the dialysis tubing will look dark purple.
c. if both iodine and starch are able to diffuse across the membrane, both the dialysis tubing and the beaker will look dark purple.

Explanation:

Iodine reacts with starch to form a dark - purple complex. If iodine diffuses into the dialysis tubing containing starch, the solution in the tubing will turn dark purple. If starch diffuses out and meets iodine in the beaker, the beaker solution will turn dark purple. If both can diffuse, both the tubing and the beaker will show the dark - purple color due to the reaction between iodine and starch.

Answer:

A. If only iodine is able to diffuse across the membrane, the solution in the dialysis tubing bag will look dark purple.
C. If both iodine and starch are able to diffuse across the membrane, both the dialysis tubing and the beaker will look dark purple.