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  #1  
Old 08-22-2007, 01:28 PM
TerryB
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Default 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!
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  #2  
Old 08-22-2007, 02:00 PM
Leopold Plumtree Leopold Plumtree is offline
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Default 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.
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  #3  
Old 02-13-2009, 06:59 AM
pharmacist_in_training
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Default 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.
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  #4  
Old 04-13-2010, 11:37 PM
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Default 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)
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  #5  
Old 03-12-2011, 08:09 PM
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Default 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
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  #6  
Old 05-11-2011, 09:28 AM
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Default Re: Percent concentration to mg/ml?

pharmacist_in_training is right
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  #7  
Old 06-21-2011, 01:45 AM
MANI
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Thumbs up 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
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  #8  
Old 09-20-2011, 10:45 AM
dentist
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Default 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.
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  #9  
Old 05-19-2012, 01:03 AM
meenajadhav
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Default Re: Percent concentration to mg/g?

please tell me how to convert percentag to mg/g
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  #10  
Old 11-23-2012, 12:59 PM
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Default 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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