Question

A prescription is written for 500 mL of a 7% NaCl solution. The technician has a 50% NaCl solution. What volume of

50% NaCl is required for the 7% solution?
mL

Answer 1

70 mL

Step-by-step explanation:

To solve this problem we can use the C₁V₁=C₂V₂ equation, where the subscript 1 refers to the concentrated solution while subscript 2 refers to the diluted one, as follows:

• C₁ = 50

• V₁ = ?

• C₂ = 7

• V₂ = 500 mL

We input the data:

• 50 * x = 7 * 500 mL

And solve for x:

• x = 70 mL

Thus the answer is 70 mL.