Question

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of NaCl solute needed to prepare 275.0 mL of a physiological saline solution.

Answer 1

Answer:

2.41 g NaCl

Explanation:

We are given the;

Molarity of NaCl = 0.150 M

Volume of the solution = 275.0 mL

We are required to calculate the mass of NaCl solute;

Step 1: Number of moles of NaCl solute

Moles are calculated by;

Moles = Molarity × Volume

Therefore;

Number of moles of NaCl = 0.150 M × 0.275 L

                                           = 0.04125 moles

Step 2: Mass of NaCl solute

Mass of the compound is given by multiplying the number of moles by the molar mass of the compound.

Molar mass of NaCl = 58.44 g/mol

Therefore;

Mass of NaCl = 0.04125 moles × 58.44 g/mol

                       = 2.41 g

Thus, the mass of NaCl solute is 2.41 g