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  • mg to mg/ml

    I have 250mg of dry powder that I need to convert to a 10mg/ml solution. I was thinking since 10mg/ml is 1% I would add 25 ml of solvent. I am on the right track.

  • #2
    Re: mg to mg/ml

    If you want 10 mg of powder per ml of solvent, then:

    250 mg / 10 mg/ml = 25 ml

    So you would need 25 ml of solvent.

    You came up with the correct answer, but you came up with it in a weird way. 10 mg/ml is not 1%, and 1% of 250 is 2.5 not 25. But you ended up with a correct result so we overlook how you did it.

    Comment


    • #3
      Re: mg to mg/ml

      Also, if you need the resulting solution for analysis, you have to weigh the powder carefully, and you have to make the solution up in a volumetric flask. In this case, you need 25mL total, not 25mL solvent, + 250mg powder. You weigh the powder, you wash it into the flask with solvent, rinse out the weighing vessel several times, and add each rinse to the flask. Make sure all the powder is disolved (or at least properly dispersed if it doesn't disovle), then make up to the mark with solvent.

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      • #4
        Re: mg to mg/ml

        In defence of the the originator, and not wishing to undermine the administrator, my understanding is that 10mg/ml IS 1% (w/v) and 250mg is 1% of 25ml so I can understand how he came up with the answer, albeit I agree it is a weird way to do it.

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        • #5
          Re: mg to mg/ml

          10/1 = 10 not .01 or .1

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          • #6
            Re: mg to mg/ml

            10/1 = 10 Correct but its not 10/1 if ml were 1 then it would say 1 but its ml so there is something beyond they laymens brain here.

            swim instinct says it isnt 1% but brain cant argue with it not being 1% till he put it all out here.

            10 milligrams of X per Millilitre of Liquid
            1000 milligrams of X per 100 millitres
            10 000 milligrams of X per 1000 militres
            10 grams per litre.
            1 gram per 0.1 litre

            Swim can see it now, 10mg of X per Millilitre is effectivellu

            100mg per 10mls
            1000mg per 100mls
            10 000mg per litre
            which is 10grams per litre
            10/1000
            1/100
            0.01 x 100/1= 1%

            Fare to tired atm to now requestion any logic issues.
            i tried but brain hurts good night

            Comment


            • #7
              Re: mg to mg/ml

              I would like to know how to get the grams to ml in this formula (doxepin 33%, gabapentin 6%, lidocaine 5% in lipoderm cream) 60 grams or 1000 grams

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              • #8
                Re: mg to mg/ml

                if you have 20 mg strength powder and want to make a solution in a 30 mL bottle... how much powder do you use? is it 6.7 g? please advise... thanks!

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                • #9
                  Re: mg to mg/ml

                  .66mg/ml base on my computation, not g

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                  • #10
                    Diesel litre to kilograms

                    I bring 600 ltrs diesel but it is calculate only 500 kgs. I want know specific convertion.

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                    • #11
                      Re: Diesel litre to kilograms

                      Originally posted by Unregistered View Post
                      I bring 600 ltrs diesel but it is calculate only 500 kgs. I want know specific convertion.
                      The density of diesel can vary lot to lot. For high precision, it should be measured for the lot in question. On average, it runs about 0.84 kg/L, so 600 L should be around 504 kg, so 500 kg seems reasonable (within range of variation).

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                      • #12
                        Re: mg to mg/ml

                        Best way to calculate

                        vial contains 500mg/1ml

                        dose prescribed is 300mg

                        how much would you draw up

                        Comment


                        • #13
                          Re: mg to mg/ml

                          0.6ml or 3/5 of a ml

                          Originally posted by Unregistered View Post
                          Best way to calculate

                          vial contains 500mg/1ml

                          dose prescribed is 300mg

                          how much would you draw up

                          Comment


                          • #14
                            Re: mg to mg/ml

                            How to 500 mg po qd x 30 days but on shelf i have 220mg/5ml 473. how many ml is required for one dose

                            Comment


                            • #15
                              Re: mg to mg/ml

                              Originally posted by Unregistered View Post
                              How to 500 mg po qd x 30 days but on shelf i have 220mg/5ml 473. how many ml is required for one dose
                              500 mg x 5 mL/220 mg = 11.4 mL

                              Comment

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