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number of moles in br2 solution

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Borek:

--- Quote from: yitzik on July 23, 2021, 06:38:14 AM ---maybe there is a way to calculate the average density of the two substances? or weighted mean of the densities or something like that?
--- End quote ---

Sorry, but no.

You can do some approximations, but volumes are not additive, so you never know what kind of error you make.

If you have no density tables best you can do is to take just the density of the solvent and pray the error won't be too large.

Borek:

--- Quote from: Orcio_Dojek on July 23, 2021, 08:03:05 AM ---True, as density of the solution grows linearly with the growth of mass concentration (fits the y = a + bx function).

--- End quote ---

Please don't comment on things you have no idea about.

Here is a "straight line" for the acetic acid.

Orcio_87:
@Borek yitzik asked about 10 % solution of Br2 in CH2Cl2. To point of about 40- 50 % conc. density of acetic acid does not differ that much from y = a + bx.

Borek:
1. You never said it holds for low concentrations only, you stated it as if it was a general rule. It is not.

2. OP doesn't have the data to fit the line, so your advice is still useless.

Orcio_87:
Still not so useless as "taking just the density of the solvent and pray the error won't be too large".

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