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

70 mL

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:

We input the data:

And solve for x:

Thus the answer is 70 mL.

false

because it does not have the potential to be entirely used up