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Asked Sep 4, 2019
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A 0.9% solution of NaCl is considered isotonic to mammalian cells. What molar concentrations is this? ___________ M

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Expert Answer

Step 1

The given solution is 0.9 % solution of NaCl which means 0.9 g of NaCl is present in 100 mL water.

 

The number of moles of NaCl in 100 mL water is calculated by the expression given in equation (1) in which n is the number of moles, m is the given mass and M is the molar mass. The value of number of moles is calculated in the equation (2).

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. () M 0.9 g 58.44 g/mol (2) 0.0154 mol |

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Step 2

The volume of water is 100 mL which is equal to 0.100 L.

 

The molarity of a solution is calculated by the expression given in equation (3) in which M is the molarity of...

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(3) V(in L) 0.0154 mol n 0.100 L (4) =0.154 M

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