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#1
08-22-2007, 02:28 PM
 TerryB Guest Posts: n/a
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
08-22-2007, 03:00 PM
 Leopold Plumtree Supreme Mumbler Join Date: Mar 2007 Location: WI Posts: 399 Rep Power: 7
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
02-13-2009, 07:59 AM
 pharmacist_in_training Guest Posts: n/a
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
04-14-2010, 12:37 AM
 Unregistered Guest Posts: n/a
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
03-12-2011, 09:09 PM
 Unregistered Guest Posts: n/a
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
05-11-2011, 10:28 AM
 Unregistered Guest Posts: n/a
Re: Percent concentration to mg/ml?

pharmacist_in_training is right
#7
06-21-2011, 02:45 AM
 MANI Guest Posts: n/a
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
09-20-2011, 11:45 AM
 dentist Guest Posts: n/a
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
05-19-2012, 02:03 AM
Re: Percent concentration to mg/g?

please tell me how to convert percentag to mg/g
#10
11-23-2012, 01:59 PM
 Unregistered Guest Posts: n/a
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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