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### Topic: How to convert the gram to mg/100mL (vice versus)  (Read 23765 times)

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#### yy

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##### How to convert the gram to mg/100mL (vice versus)
« on: April 03, 2009, 08:26:21 AM »
Hi -

I have been struggling to figure out how to convert 1.0645gNaCl in 10g Soup Sample to "mg/100mL" (or the other round).
( let sodium alone, the result is 0.5477g in 10gram of soup sample)
The goal in understanding this is that,
I recently did a titration to determine the salt [NaCl] content of dried soup powder.

The Manufacturer spec. says, Sodium content of the powder is, 285mg/100mL.
All I would like to do is to compare how each result and claim is valid.

What information do I need and what would be the first step to this conversion ?
Do you go from mg/100ml  gram?
Or gram to mg/100mL?

#### Borek

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #1 on: April 03, 2009, 09:04:18 AM »
You need volume of the serving, everything else is a simple unit conversion.
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#### yy

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #2 on: April 03, 2009, 04:58:01 PM »
Thank you for this,

So do I need a density of salt /sodium to convert the sample(g) into mL(volume)?

The calculated result [NaCl in g] is 1.895g.
The calculated result [Na in g] is 0.745g.

#### enahs

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #3 on: April 03, 2009, 05:14:24 PM »
You need the density of the soup.
If you have 10 grams of soup, how many mL do you have?

How many mg was in that many ml's?

#### Borek

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #4 on: April 03, 2009, 05:27:35 PM »
My bet is that 10g is of dried soup powder, not the ready to eat soup after water was added.

My other bet is that you may assume 1 g/mL.
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#### yy

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #5 on: April 03, 2009, 11:08:43 PM »
Okay, will try them out. Thanks

#### yy

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #6 on: April 04, 2009, 05:03:12 PM »
Let me spell out what I tried:

For 10g of dried soup power, NaCl(g) is found 1.0645g.

So, first I find 1gram NaCl in 1gram soup: 1.0645g salt/10gram dry soup =0.10645g per g soup.

Now, as suggested, assumed that 1g/ml, and did conversions to miligram per ml:

0.10645g/mL x(100/100)x(1000mg/1g) = 10645mg/100mL

10645mg/100mL is my answer but it does look too large,
Where am I making mis steps....?

Manufacturer spec. for sodium in one serving is about 285mg/100mL
My answer is for salt[NaCl] yet the number for salt I am getting is a bit too large.

I didn't think it is this complicated to convert to one serving, but still I am not getting this!

#### Arkcon

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #7 on: April 04, 2009, 05:15:13 PM »
You have one more conversion to do, you must convert grams NaCl to grams of Na.  Yes, I know, soup doesn't contain free Na, but that is how it is quantified.  Like it's already been said, Na is the nutritional component regulatory agencies are interested in.  Ther may also be other sodium salts you've neglected when quantifying free chloride ion, for example, if the ingredients list also specifies monosodium glutamate.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

#### Borek

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #8 on: April 04, 2009, 05:21:24 PM »
What is recipe for soup preaparation? Doesn't it call for water addition before serving?
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#### Arkcon

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #9 on: April 04, 2009, 05:26:05 PM »
What is recipe for soup preaparation? Doesn't it call for water addition before serving?

Yes, Borek: raises another important point.  You've samples an amount of the soup powder, how does that compare to the serving size of the soup?  It is probably "one serving" of product that is used to report nutritional information, and companies are not at all ashamed if that serving size reported is much smaller or much larger than a typical person would like to eat, or is included in the package.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

#### yy

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##### Re: How to convert the gram to mg/100mL (vice versus)
« Reply #10 on: April 05, 2009, 05:24:01 PM »
Thank you both for the input.
I went back to the soup packet,
it says the pack contains net45g, 3 servings.

So devided 45 by 3, I get 15g per serving.
Back of the pack only says in the units mg/ml,  but now I know
One serving 565mg/15g.

That is the magical number I needed in order to convert! It wasn't surprising if I had hard time figuring out without that. so thanks. And looks like Sodium content of the soup powder is quite larger than we probably like to see.