[ken3009]

we have an anton paar dma4500 density meter in our lab, but im not sure if very thick samples (eg. sugar extract) can be run in it. cant find info in the manual.

my question is , in order to find the density of this thick liquid,  if i dilute 5ml of it in 50ml water (in volumetric flask)..that is 10% solution, then this will be less thick and i can run in the density meter and get a value for density.

now, armed with this value from machine (lets say 0.9 g/cm3)..is there a way to calculate the original density of the sample?
its not as simple as multiplying this value by 10 is it? (cos its 10% solution)
denisty of water of course is 0.9982g/cm3

any ideas please??

[Borek]

my question is , in order to find the density of this thick liquid,  if i dilute 5ml of it in 50ml water (in volumetric flask)..that is 10% solution, then this will be less thick and i can run in the density meter and get a value for density.

now, armed with this value from machine (lets say 0.9 g/cm3)..is there a way to calculate the original density of the sample?

No, from this information you can't say anything about the density of the undiluted solution. The only sure way is to measure the density of the original liquid.

[curiouscat]

The only idea I have is if you constructed partial molar volume curves. Those are additive unlike densities.

Probably more trouble than it's worth though and you are still left with the problem of how to construct those accurately in the high density region.

Another option is find a instrument that does work in the high density region and use it to construct dilution curves for calibration. Subsequently you can use your stated dilution procedure.