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Topic: Relationship between density and mass concentration  (Read 10652 times)

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Offline Caustikola

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Relationship between density and mass concentration
« on: February 20, 2012, 07:52:06 AM »
Hi
i was just thinking of a relationship between the mass concentration of a solution of a solid solute(in water) and the density of the solution
I came up with this:
mass Concentration(g/L)=Mass of solute/Volume of Solution.
If the solute dissolves with little or no volume change, volume of solution=Volume of water used to dissolve the solute

Let Mass of solute=Ms
Volume of Solution=Vw
Mass of Water used in dissolving the solute=Mw
density of solution=d
Mass concentration(g/ml)=c=Ms/Vw
Mass concentration(g/L)=C
d=(Ms+Mw)/Vw
density of water=Mw/Vw=1
Ms/Vw=c
hence d=c+1
c=d-1
thus in g/L,
C=1000(d-1)

is this correct? Any suggestions, modifications, or is it just plain wrong?
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Offline Andy TB

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Re: Relationship between density and mass concentration
« Reply #1 on: February 20, 2012, 08:11:59 AM »
Why not test your hypothesis yourself? Make up some known concentrations and measure the densities. Compare results with your theory.

Offline Borek

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Re: Relationship between density and mass concentration
« Reply #2 on: February 20, 2012, 08:45:16 AM »
If the solute dissolves with little or no volume change

Big IF.
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