A medical saline solution is prepared by mixing 925 mg sodium chloride (58.44 g/mol) with water to make 100.0 mL solution. What is the molar concentration of this solution?

Question

Quizplus · Accepted Answer

1. Calculate the number of moles of sodium chloride:

925 mg ÷ 58.44 g/mol = 0.0158 mol

2. Calculate the volume of the solution in liters:

100.0 mL ÷ 1000 mL/L = 0.100 L

3. Calculate the molarity of the solution:

Molarity = moles ÷ volume 
Molarity = 0.0158 mol ÷ 0.100 L = 0.158 M

A Medical Saline Solution Is Prepared by Mixing 925 Mg