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#1




Percent concentration to mg/ml?
I'm preparing to teach a class in local anesthesia to dental hygienists.
For the life of me I can't seem to understand % concentration. The textbook says that a 2% solution of lidocaine is equal to 20mg/ml. A 3% solution is equal to 30mg/ml and so on. I don't understand how they come up with 20. 1ml must equal a thousand of something! 
#2




Re: Percent concentration to mg/ml?
I think it's based on the idealized assumption of 1000 mg/mL (that is, both the solvent and solute have densities similar to water). 20/1000 = 2%.
I'm sure someone else could provide a better answer. 
#3




Re: Percent concentration to mg/ml?
% concentration is based on g/100mL.
a 2% solution is 2g/100mL, or 2000mg/100mL. This reduces to 20mg/mL. 
#4




Re: Percent concentration to mg/ml?
in this case % concentration is based on g/ml
a 2% solution is: (1ml x 2%)/100 = 0,02g/ml 0,02g/ml x 1000 = 20mg/ml (becouse 1g = 1000mg) 
#5




Re: Percent concentration to mg/ml?
It s simple,,,,
2 % solution means,,,,,,2 gm in 100 ml so it means,,,,,2x1000 mg in 100 ml means 20 mg/ml 
#6




Re: Percent concentration to mg/ml?
pharmacist_in_training is right

#7




Re: Percent concentration to mg/ml?
The basic formula to obtain the required ml of solvent or mg of solute for any % of solution needed is "mg/ml=%X10". using this formula, to make 2% lignocaine solution,
mg= % X 10 X ml. mg= 2 x 10 x 1 mg= 20 i.e 20 mg per ml gives 2% solution i.e 200 mg per 10 ml gives 2% solution i.e 2000 mg (2g) per 100ml gives 2% solution 
#8




Re: Percent concentration to mg/ml?
I agree, pharmacist_in_training is right.
So if you have 1 carpule of 1.7 mL of 2% Lidocaine, you have ( 1.7 mL x 20 mg/mL) 34 mg of Lidocaine in that carpule. 
#9




Re: Percent concentration to mg/g?
please tell me how to convert percentag to mg/g

#10




Re: Percent concentration to mg/ml?
let's say that we have 15% solution and we want to convert it to mg/ml:
15% means 15 gm/100 ml=15000 mg/ 100 ml= 150 mg /ml 
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