a pharmacy tech adds 10ml of a stock solution into 200ml of water.

what is the percent v/v
my answer is 5%
need help with the formula

1 answer

The percent v/v formula is:
(percent volume/volume) = (volume of solute / volume of solution) x 100%

In this case, the volume of solute (the stock solution) is 10ml, and the volume of solution is 10ml + 200ml = 210ml. So:

(percent volume/volume) = (10ml / 210ml) x 100%
(percent volume/volume) = 0.0476 x 100%
(percent volume/volume) = 4.76%

Therefore, the percent v/v is approximately 4.76%, not 5%.