19. The inside of a red blood cell is about 300 mOsm. a)...

19. The inside of a red blood cell is about 300 mOsm. a) Label the milliosmolality (mOsm) of interior of the red blood cell, and of each of the NaCl solutions surrounding the cells (see question 18). b) Draw arrows to indicate the direction of water movement for each test tube. c) Below each illustration, label whether the each NaCl solution is isotonic, hypertonic or hypotonic. Red blood cell in 9 g/dl NaCl: NaCl solution ______ mOsm Red blood cell ______ mOsm Red blood cell in 0.9 g/dl NaCl ______ mOsm ______ mOsm Red blood cell in 0.15 g/dl NaCl ______ mOsm ______ mOsm

Transcript

00:02 So now we have a red blood cell.

00:05 We know that it has a 300 milosmo similarity.

00:11 Now, and then it's sitting in different kind of sodium chloride solution.

00:16 One is 9 gram per deciliter.

00:18 The other is 0 .9 gram per deciliter, and the last one is 0 .15 gram per deciliter.

00:25 Sodium chloride.

00:26 Obviously, you want to label the merely osmolarity of the interior of the red blood cell, also calculate the all similarity of the sodium chloride in the cell, or surrounding the cell, which is in a solution.

00:41 And also you want to use arrow to indicate a direction of water flow and indicate whether the solution is is is so hyper or hypotonic to the rebel cell.

00:51 So let's start from the very first one, which is the 9 gram per decilator of sodium chloride.

00:58 So first of all, we had to find out the molecular weight of the sodium chloride is 50.

01:02 Gram per mole so we want to first will convert nine gram into mole nine gram divided by the molecular weight 58 gram per mole equals about 0 .15 mole now we know the most so now we convert the gram to mole the next step you want to calculate the the the molarity so the malaria equals the 1 .5 mole divide by the volume.

01:42 Now we know that it's deciliter.

01:45 One deciliter is 0 .1 liter.

01:49 So you plug in 0 .1 liter here.

01:54 0 .15m.

02:00 Divide by 0 .1 liter, 1 .5 mole per liter.

02:08 This is also molar.

02:10 So 1 .5 mole molar m.

02:14 So this is the concentration of sodium chloride of 9 gram per deciliter of.

02:20 Now this is just the molarity of sodium chloride itself, but sodium chloride, when it dissolved in water, it dissociate to form sodium ion and chloride ion.

02:34 So you have two ions from one molecule of sodium chloride.

02:38 So this means one molar of sodium chloride will dissociate to produce two osmole because you have two ions.

02:51 So this also tell us that when we have 1 .5 more of sodium chloride, the osmo is going to be 1 .5 times two, which is two different ions.

03:06 So this is going to be three osmo in the solution.

03:15 All right.

03:16 So we also know that 1 osmo equals 1 ,000 millioosmo.

03:24 So 3 osmo can be converted into times 1 ,000 millioosmo.

03:29 3 ,000 millioosmo...

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