A 0.89% (w/v) sodium chloride solution is referred to as physiological saline solution because it has the same concentration of salts as human blood. What is the molarity of a physiological saline solution?
A)0.0028 M
B)0.015 M
C)0.15 M
D)0.30 M
E)0.35 M

Question

Quizplus · Accepted Answer

To calculate the molarity, we need to first find the moles of sodium chloride present in one liter of 0.89% (w/v) solution.

0.89% (w/v) = 0.89 g/100 mL
Since the density of water is 1 g/mL, we can convert this to mass per liter (1000 mL):
0.89 g/100 mL x 10 = 8.9 g/L

The molecular weight of NaCl is 58.44 g/mol.
So, the number of moles of NaCl in one liter of solution is:
8.9 g/L ÷ 58.44 g/mol = 0.1522 mol/L

Therefore, the molarity of the solution is 0.1522 M, which is closest to answer choice C (0.15 M).

A 089% (W/v) Sodium Chloride Solution Is Referred to as Physiological