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ok i did the math and figured out that 5g is 3.75ml.so if i order d's oil solution and use 25g test cyp and 81.25ml's of his oil ba,bb solution that would make 100ml at 250mg/ml.if i use 30g deca in 77.5ml of his solution that would make 100ml of deca at 300mg/ml.
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Yeah bro, the calcs are close enough. You used a Delta-V of .75......but I know this is different for certain powders usually ranges beyween .75 to .85, so it's a close enough estimate.
How exactly did you figure out that 5g = 3.75 ml? To accuratley get the delta-V you would have to dissolve each specific powder in a solution and measure the volume change when it's completely dissolved........and this will usually range from .75 to .85 ml/g is this what you did? -
i used eq it is a liquid at like 100 degrees.Comment
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wats is the Delta-VComment
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The delta-V of a powder is how much volume a powder will displace when completely dissolved in a solution. For example a delta-V of .75 would mean that 1 g of a cetain powder will occupy .75 ml volume.Comment
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delta-V is also called density. Mass/Volume. IOW, if 1g powder displaces 1ml of soln in a gradeated cylender, the delta-V (density) is: 1/1=1g/ml. Or with Gator's example 0.75/1= 0.75g/ml.Comment
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Actually it isn't that simple. Density is not the same. Density could only be used accurately to measure displacement if the powder was totally insoluble.Originally posted by candle25
delta-V is also called density. Mass/Volume. IOW, if 1g powder displaces 1ml of soln in a gradeated cylender, the delta-V (density) is: 1/1=1g/ml. Or with Gator's example 0.75/1= 0.75g/ml.
Delta-V is a thermodynamic property (delta-V of mixing). For instance, if you mix 1mL methanol with 1mL water, you will not come out with exactly 2mL total solution. It will be a little more or a little less depending on whether the delta-V of mixing for methanol and water is positive or negative.
The delta-V of mixing is an intrinsic property of BOTH materials being mixed. That is, the delta-V for dissolving sugar in water is different than that for dissolving sugar in methanol. It depends on how the solute molecules are solvated. How many molecules of solvent fit around each solute molecule and how do the solute molecules aggragate (sp?)?
It is totally my fault that people are using the term delta-V incorrectly. I tried to simplify the concept and wasn't very successful. It can be a difficult one to wrap your mind around.
How about this: On average, 1 gram of powder translates to 0.75 to 0.8mL in volume. While this does have the same units as density (g/mL), it isn't truly the density of the powder technically.
Sigh. This is why I did not become a teacher, LOL. I suck at getting these things across in an understandable way.Comment
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