A) The sac in beaker 1 turns pink as phenolphthalein moves through the sac membr

Question

A) The sac in beaker 1 turns pink as phenolphthalein moves through the sac membrane indicating an acid pH. The sac in beaker 2 turns black as starch moves through membrane.

B) The liquid in beaker 1 turns black due to starch moving through the membrane into the liquid. Starch turns blue black in the presence of of bases (OH-). The liquid in beaker 2 turns pink due to bases moving into the liquid. Iodine turns pink in the presence of bases. The experiment does not work when the conditions are reversed. Phenolphthalein degraded membranes and the sac disintegrates. Beacker 2 becomes so dark that no results can be interpreted.

C) The liquid in bag 1 turn pink due to (Na)OH- moving through the membrane and raising the pH the liquid in bag Turns black due iodine
Moving through the membrane, starch is too large to move through the membrane (dialysis tubing)
The water in beaker becomes pink due to the presence of acids as NaOH moves through the membrane the starch in beaker moved into the sac the bag turned black as a result

D) The water in beaker becomes pink due to the presence of acids as NaOH moves through the membrane the starch in beaker 2 moved into the sac. The bag turned black as a result.

E) None of the above

Explanation / Answer

Beaker 1: The NaOH can diffuse into the beaker and raise the pH causing the phenolphthelein to turn pink due to basicity. Beaker 2: The starch is too big to move across the membrane, but the iodine can, so it moves from the beaker into the sac, and then the iodine reacts with starch (the classic iodine test) to give a blue black color in the sac. Hence your answer is: C) The liquid in bag 1 turn pink due to (Na)OH- moving through the membrane and raising the pH the liquid in bag Turns black due iodine Moving through the membrane, starch is too large to move through the membrane (dialysis tubing) The water in beaker becomes pink due to the presence of acids as NaOH moves through the membrane the starch in beaker moved into the sac the bag turned black as a result

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