that depends on the liquid
in water it would be (5ng)/mg because 1ml=1mg for water
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
You have to give 3 times 5 mg = 15 mg therefore you have to give 3 times 2 ml = 6 ml (15 mg = 6 ml of whatever that bottle contains).
It looks like the 3.5 ml may be extraneous information. If 1 ml yields 250 mg, then you need 400/250 = 1.6 ml, to get 400 mg.
2 mg per 1 ml is more concentrated but that means that you will need a bigger quantity of the 0.2 mg per 1 ml mixture for the same amount of the active ingredient.
It is not possible to answer this without knowing the density of the active ingredient per ml. I.e some drugs may be 1000mg per ml, whereas others could be 2mg per ml. There is no standard "amount per ml" for all liquid medicines etc...
1g = 1000 mg → 2 g = 2 × 1000 mg = 2000 mg → 2 g in 150 ml = 2000 mg per 150 ml = 2000 ÷ 150 mg per 150 ÷ 150 ml = 13 1/3 mg per ml
This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass and mL (milliliters) is a measure of volume.
7.5 mL per 75 mg which is 10 mg per mL
It is supposed to be 50 nanograms per ml in a standard test
0.2 ml
cc = ml if you assume that density is 1 g / ml, you assume a gram is a millilitre then 300 mg / ml = 300,000 mg per kilogram
0.00022
Promethazine HCl 3.6 mg per 5 ml Codeine Phosphate 9 mg per 5 ml Ephedrine HCl 7.2 mg per 5 ml
84 mg/ml, or 1680 mg/20 ml
0.005 ug/ml
I am a pharmacist. 7.5 mL (1.5 teaspoonfuls) of 50 mg per mL Demerol syrup will contain 75 mg. It is a simply and straightforward calculation, but if it helps, you can think of 50 mg per 5 mL as being 10 mg per mL. Therefore, 7.5 mL of the syrup contains 75 mg.
Twenty 250 mg tablets are needed to make 50 mL if the concentration is to be 500 mg per 5 mL.