Hello, I am very much confused about some calculations and would appreciate if anyone out there can bail me out.

How can one calculate the Molar concentration of a drug if one is asked to inject an animal with 5mg/Kg body weight ( assuming the drug is Aluminum sulphate).

If the animal weighs 60g and one is to inject it with 5mg/Kg bodyweight of Aluminum sulphate, what is the molar concentration of the amount of Aluminum sulphate to be injected.

I would very much appreciate your response. Thanks in advance.

hi, here is the way you do the calculations.
assuming the Molar concentration of your Aluminum sulphate (Molecular Weight 342) is A, then your w/v concentration would be A*342g/L.

and the total injection of the 60g animal should be (5mg/Kg)*(0.06kg), that is 0.3mg, and which is 0.0003g

so the injection volume (L) will be 0.0003/(A*342). and injection volume (ml) is 0.3/(A*342)

hope it helps

Oh, thanks a lot for your response. I really appreciate it.

qinglongyanyuedao said:

hi, here is the way you do the calculations. assuming the Molar concentration of your Aluminum sulphate (Molecular Weight 342) is A, then your w/v concentration would be A*342g/L. and the total injection of the 60g animal should be (5mg/Kg)*(0.06kg), that is 0.3mg, and which is 0.0003g so the injection volume (L) will be 0.0003/(A*342). and injection volume (ml) is 0.3/(A*342) I hope it helps