Five dialysis bags, constructed from a semi-permeable...

Five dialysis bags, constructed from a semi-permeable membrane that is impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed) and the percent change in mass of each bag was graphed. Refer to figure below and answer the following questions,Which line represents the bag that contained a solution isotonic to the 0.6 molar solution at the beginning of the experiment?

Transcript

00:01 All right, guys, so we're going to take a look at an experiment on osmalarity.

00:04 In this case, we have an experiment where an initial concentration of a six -moler sucrose solution was placed into different unknowns, and at the end of the experiment, the bags were weighed, and we're looking for the isotonic solution in this experiment.

00:24 So we're going to keep this really super simple, and we're going to look at three solution types, so we're going to talk about the movement of water and what would happen to our dialysis bag with each.

00:34 Okay, so in this first one, let's just represent this six molar solution, really super simple, and we're just going to do six red dots.

00:43 This represents my six more solution for this experiment.

00:49 Okay, so this is my beaker with my six more solution of a solution, and what we're going to put in it is a, dialysis bag.

01:01 Okay, so dialysis bags allow for water to move back and forth, but they generally are, the pores are not large enough to allow things like sucrose to move back and forth.

01:10 So in an isotonic solution, we're going to have two equal solutions.

01:15 So we're going to represent this guy 6m and 6m with just these little, these little red and blue dots.

01:23 So again, this is our solution, and this is our dialysis bag.

01:29 If they're isotop.

01:30 Solutions, that means that they have the same amount of solutes and solvent.

01:36 And so in terms of water movement, we're going to see equal water moving in and out.

01:40 So we are not going to see a change in the weight of this dialysis bag.

01:46 So our h2l movement in and out of our dialysis bag is going to wind up being equal here.

01:55 All right, we jump down to our hypertonic solution.

01:58 So again, let's just represent this with the little red dots.

02:02 In this case, since the solution is hypertonic, it's going to have more solutes.

02:06 And so instead of just using six little red dots, i'm going to use more than that to represent a solution that has more solutes in it.

02:16 So again, though, our dialysis bag, remember, it's going to stay the same.

02:20 It's going to be that six -molar solution.

02:23 And so we're going to represent it just again with our six dots representing our six molar solution.

02:27 In this case, water always likes to move from where it's highly concentrated to where it's lower concentration...

Question

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