July 18, 2019, 10:15:59 PM
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### Topic: Sodium Ascorbate in mOsm/L?  (Read 566 times)

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#### Simmons

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##### Re: Sodium Ascorbate in mOsm/L?
« Reply #15 on: May 12, 2019, 07:05:51 AM »

Within 20 % error - yes.
Within 5 % error - no.

Thanks.

I'm not concerned about the error 5 or 20% but the osmolarity of sodium ascorbate in grams in the final solution.

Care to share the formula how I could measure that, and how you come up with 5-20% errors?

Thanks again.

PS: An acquaintance has tried with 100 grams in 1000 ml, with normal osmolarity of 300 mosm/l....but is away, otherwise won't have bothered you.

#### AWK

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##### Re: Sodium Ascorbate in mOsm/L?
« Reply #16 on: May 12, 2019, 07:16:24 AM »
I told you - just find densities of sodium ascorbate solutions. Taking them as an approximation you can calculate osmotic concentrations with an error of about 2 % for 200 g sodium ascorbate and about 5% for 50 g of sodium ascorbate.
To lowering error you can measure densities of a few solutions with salt and then interpolate densities - this may give you the error even lower than 1 % (but this depends on the precision of measurements) but still neglecting osmotic coefficient which changes with concentration.
AWK

#### Simmons

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##### Re: Sodium Ascorbate in mOsm/L?
« Reply #17 on: May 19, 2019, 06:04:38 PM »
I'm getting 1 Osmol/L, of sod. ascorbate 100 grams dissolved in 1 liter of water.

1. How much would that be in mOsmol/L?

2. How much would be Osmol/L, IF it were 0.9 % saline 1 liter?

Thanks.

#### AWK

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##### Re: Sodium Ascorbate in mOsm/L?
« Reply #18 on: May 20, 2019, 02:28:33 AM »
I'm getting 1 Osmol/L, of sod. ascorbate 100 grams dissolved in 1 liter of water.

1. How much would that be in mOsmol/L?

2. How much would be Osmol/L, IF it were 0.9 % saline 1 liter?

Thanks.
1 Osmol/L - this value is accepted with an error slightly less than 5 %
Converting Osmol/L to mOsmol/L is very simple.