Percent concentration to mg/ml?

[TerryB]

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!

[Guest]

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.

[pharmacist_in_training]

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.

[Unregistered]

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)

[Unregistered]

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

[Unregistered]

Re: Percent concentration to mg/ml?

pharmacist_in_training is right

[MANI]

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

[dentist]

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.

[meenajadhav]

Re: Percent concentration to mg/g?

please tell me how to convert percentag to mg/g

[Unregistered]

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

[Unregistered]

Re: Percent concentration to mg/ml?

IF you see something that has a concentration of 2.0%, and easy way to convert this to milligrams is to move the decimal one place to the right. So 2.0% equates to 20mg/ml or 4.0% would be 40mg/ml.

[agapelccc]

does .2 grams equal one fourth of a gram

Does .2 of a gram equal one fourth of a gram

[JohnS]

Re: does .2 grams equal one fourth of a gram

Does .2 of a gram equal one fourth of a gram

one fourth is 0.25, whether grams or something else. 0.2 is one fifth (1/5).

[amit sharma]

Re: Percent concentration to mg/ml?

1mg/1ml = 1000ppm
1 % = 1000mg/100ml
therefore 1% = 10 mg/ml
2 % = 20mg/ml
and so on

i think this will help u. if any doubt send me a mail on [email protected].

thanks/regards
amit sharma
research chemist (ARD)

[Unregistered]

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

Thank you!

You're the only in the whole internet that knows how to explain that!!!!