Question

Cefaclor's reconstitution directions calls for the addition of 90 mL of water to make a 150 mL container with a concentration of 250 mg/tsp. Calculate the final percentage strength (w/v) of the reconstituted solution. Round the final answer to a whole number

Answer 1

Calculation of final percentage strength:

Total mL in the container = 150 mL

Concentration of the solution = 250 mg/ tsp

150 mL = 30.43 teaspoon ( United States ) ,

as 1 mL = 0.202 teaspoon

Concentration of solution = 250mg/ tsp =

250× 30 .43 = 7607 .5 mg / ml

= 7.607 g/ ml.

Final percentage strength =

% w/ v ( weight / volume) = weight of the solute in gram / volume of solution in mL × 100

= 7.607 g / 150 mL × 100

= 5.071 w/ v

The final percentage strength of the solution is = 5%