Question

a doctor's order is 0.125 g of ampicillin. the liquid suspension on hand contains 250 mg/5.0 ml. how many milliliters of the suspension are required?

Answer 1

Answer : The volume of the liquid suspension required are, 2.5 milliliters.

Explanation : Given,

Mass of ampicillin = 0.125 g

First we have to convert the mass of ampicillin into milligram.

Conversion used : (1 g = 1000 mg)

As, 1 gram of ampicillin = 1000 milligram of ampicillin

So, 0.125 gram of ampicillin = $\frac{0.125g}{1g}\times 1000mg=125mg$ of ampicillin

The mass of ampicillin = 125 mg

Now we have to calculate the volume of liquid suspension.

As, 250 mg of ampicillin contain in 5.0 ml of liquid suspension

So, 125 mg of ampicillin contain in $\frac{125mg}{250mg}\times 5.0ml=2.5ml$ of liquid suspension

Therefore, the volume of the liquid suspension required are, 2.5 milliliters.

Answer 2

0.125 g=(0.125 g)(1000 mg/1g)=125 mg.

Then, we need 125 mg of ampicillin.
5 ml of  liquid suspension contains 250 mg of ampicilling , therefore:

5 ml----------------250 mg of ampicilling
x--------------------125 mg of ampicilling

x=(5 ml * 125 mg of ampicilling) / 250 mg of ampicilling=2.5 ml

Answer: we require 2.5 ml