Dear Neville,
As Marshall has noted, one of your sources of error would be the
syringe... It is unlikely you can measure the 5 cc's of water
repeatedly to within the accuracy of the scale, let alone measure the
addition of a few micrograms of silver on a balance that is accurate
only to milligrams.
A good exercise would be to just measure out 5 cc's of distilled water
five different times and see how much variation you get within just
that operation alone.
If you're talking 10ppm CS, that's 10 milligrams of silver in a liter,
or 50 micrograms per 5 cc's. So, the difference in mass between 5 grams
of water and 5 grams of water PLUS 50 micrograms of silver would
probably be WAY less than your errors in measuring out the water,
totally apart from the resolution of the scale, which wouldn't be able
to even see the silver weight.
It's a worthwhile experiment, and can teach a lot about orders of
magnitude, and the precision and accuracy of measurments. These are
essential to all science.
Peace,
Mike D.
> Hope this doesn't come thru twice, had to cut.
>
> Yep, sure.
>
> 2 Different solutions used: (a) 19 days old @ 12.1uS/006-7ppm, (b) 3
> days old @ 18.5uS/009-010ppm.
>
> Step 1: Ensure digital scale was zero'd and reading in grams. Praps I
> could have used 'ct' or 'gs' {which I assume is 'grain'} or 'dwt' {don't
> know what that is} Step 2: Weigh empty 30ml plastic medicine cup. Step
> 3: Syringe 5cc/ml plain DW into cup...weigh that, then subtracted cup
> weight from DW. Step 4: Empty and dry cup thoroughly. Step 5: Syringe
> 5cc/ml EIS into cup...weight that, then subtracted cup weight from EIS.
> Step 6: Subtact this result from the other.
>
> N.
>
>
> Date: Mon, 28 Feb 2011 12:52:56 -0500
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> Subject: Re: CS>Wet weight?
>
> Can you elaborate a bit more on your procedure?
>
> Marshall
>
>
>
>
>
>
[Mike Devour, Citizen, Patriot, Libertarian]
[[email protected] ]
[Speaking only for myself... ]
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