7. Sometimes, especially in the clinical lab, concentrations will be expressed in percentage rather than molarity. The percentage concentration refers to the number of grams of solute dissolved in 100 ml of solution (eg. a 5 % solution of sucrose contains 5 g of sucrose in 100 ml of water). Normal saline, a solution that is isotonic with human blood, is a 0.85 percent solution of sodium chloride. What is the molar concentration of normal saline

The molar concentration of normal saline is 0.15 mol/L.

Explanation:

The mass of NaCl in 0.85% of normal saline is:

The molar concentration can be found using the following equation:

So we need to find the number of moles of NaCl in 1 liter of solution.

Where:

M: is the molar mass of NaCl = 58.44 g/mol

Hence, the molar concentration is:

Therefore, the molar concentration of normal saline is 0.15 mole per liter.

I hope it helps you!      

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