Question

If 75 g of active ingredient powder is mixed with 400 mL NS solution, what is the final concentration Round to the nearest hundredths (w/v)?

Answer 1

0.19 g/mL

Explanation:

The concentration of the final solution is the ratio of the mass of the powder to the volume of the solution. It may be measured in g/mL.

The final concentration

= 75/400

= 0.1875 g/mL

≈ 0.19 to the nearest hundredths

Answer 2

0.19g/mL

Explanation:

The concentration of a solution is how much of a substance in in another substance, usually the amount of solute in a solvent.

The solute is the active ingredient powder. The solvent is the NS solution.

Divide the solute by the solvent.

75g ÷ 400mL

= 75g/400mL Simplify for solute per one unit, 1 mL. Divide top by bottom.

= 0.1875g/mL Round to the nearest hundredth, second decimal place.

≈ 0.19g/mL

Therefore the final concentration is 0.19g/mL.