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g- Mozilla Firefox tActivity.doPlocator assignment-take&ctakeAssignmentSessionLocator; assignment-take Use the Refereaces to access important values if aeeded for this question. The osmolarity of physiological saline solution is 0. 300 osmol/L Assuming a membrane that is permeable only to water, what % (ww) zinc sulfate, ZnS04 solution is sotonc to physiological saline? 6 (w/v) Subnit Answer Retry Entire Group 8 more group attempts remaining Email Instructor Save and Exit Cengage Learning 1 Cengage Technical Support

Explanation / Answer

1. 0.300 osmol/L ZnSO4 = 0.300/2 mol/L ZnSO4 = 0.150 mol/L ZnSO4

1 mol ZnSO4 = 161.47 g ZnSO4

1 L = 1000 ml

Therefore,

1000 ml water contains 161.47 * 0.150 g of ZnSO4

1 ml water contains 161.47 * 0.150/1000 g of ZnSO4

100 ml water contains 161.47 * 0.150 * 100 / 1000 g of ZnSO4 = 2.42205 g of ZnSO4

% (w/v) = g / 100 ml

Therefore, 2.42205 % (w/v) zinc sulfate solution is isotonic with the physiological saline.

2. FeCl2 ------------> Fe2+ + 2 Cl-

number of ions = 3

osmolarity = osmol/L = number of ions * M

Therefore, osmolarity of 0.178 M FeCl2 solution is = 3 * 0.178 osmol/L = 0.534 osmol/L

3. The molecular weight of MnBr2 is 215 g/mol

215 g MnBr2 on dissolve in 1 L water produce 1 M MnBr2 solution

1 g MnBr2 on dissolve in 1 L water produce 1/215 M MnBr2 solution

21.5 g MnBr2 on dissolve in 1 L water produce (1/215) * 21.5 M = 0.1 M MnBr2 solution

in solution, one molecule of MnBr2 gives rise 3 ions

Therefore, the MnBr2 solution has osmolarity = 3 * 0.1 osmol/L = 0.3 osmol/L

Therefore, this MnBr2 solution is isotonic with the physiological saline solution.

As the MnBr2 solution and physiological saline solution are isotonic (having same osmotic pressure), in keeping normal red blood cells in this solution nothing would happen.

4. one molecule of lead nitrate on dissolving in an aqueous solution gives rise 3 ions.

Therefore, the osmolarity of 4.08 * 10-2 M lead nitrate solution is = 3 * 4.08 * 10-2 osmol/L = 0.1224 osmol/L

0.1224 osmol/L lead nitrate solution is hypotonic to the 0.30 osmol/L physiological saline solution. Therefore, if normal red blood cells are suspended in the 0.1224 osmol/L lead nitrate solution, then, water molecules would come out of the cell in order to balance the osmotic pressure.

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