Re: sodium hydroxide Vs carbonate
From: Steve Turner (srturner1_at_spammers_die.net)
Date: 01/29/05
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Date: Sat, 29 Jan 2005 23:41:28 GMT
On 29 Jan 2005 11:37:45 -0800, farooq_w@hotmail.com wrote:
>The acid test may give OP (assuming a beginner) a false impression, if
>the caustic soda is contaminated with carbonate and
>bicarbonate...keeping in mind the original poster's "unbranded"
>chemicals.
In fact, carbonate is a common contaminant of hydroxide.
Nevertheless, I think that a side-by-side comparison would leave no
doubt, unless the hydroxide is grossly contaminated. Remember too,
that in the presence of a large excess of hydroxide, you may never see
CO2 evolved, because the carbonic acid initially formed is immediately
converted back to carbonate by the hydroxide.
>Even lemon juice can be used for carbonate detection for home
>experiments...why a non-organic acid only?
I was going to ask the same. I'd guess he meant to restrict the acid
to small, low MW acids. Stearic acid would be a poor choice, for e.g.
Steve Turner
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