key 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 solute needed to prepare 275.0 mL of a physiological saline solution.

2.41g

Explanation:

Data obtained from the question include the following:

Molarity of NaCl = 0.150M

Volume = 275mL

Mass of NaCl =..?

Next, we shall determine the number of mole of NaCl in the solution. This is illustrated below:

Molarity of a solution is simply defined as the mole of solute per unit litre of the solution. Mathematically, the molarity is expressed as:

Molarity = mole /Volume

Molarity = 0.150M

Volume = 275mL = 275/1000 = 0.275L

Mole =..?

Molarity = mole /Volume

0.150 = mole /0.275

Cross multiply

Mole = 0.15 x 0.275

Mole = 0.04125 mole

Therefore, the number of mole of solute, NaCl in the solution is 0.04125 mole.

Finally, we shall convert 0.04125 mole of NaCl to farms. This is illustrated below:

Molar mass of NaCl =23 + 35.5 = 58.5g/mol

Mole of NaCl = 0.04125 mole

Mass of NaCl =..?

Mole = mass/molar mass

0.04125 = Mass /58.5

Cross multiply

Mass = 0.04125 x 58.5

Mass = 2.41g

Therefore, the mass of the solute, NaCl needed to prepare the solution is 2.41g

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