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 starch is able to diffuse across the membrane, the solution in the dialysis tubing will look dark purple. b. 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.

Explanation:

Iodine reacts with starch to form a dark - purple complex. If iodine diffuses into the tubing with starch, the solution in the tubing will turn dark purple. If both iodine and starch can diffuse, both the tubing and the beaker (where the other substance is initially) will have the iodine - starch complex and look dark purple.

Answer:

B. 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.