What is Light's solution?

I saw Light's solution in a chemical supply magazine, but I have no idea as to what it is or what it's used for. I've googled it and wikipedia'd it, but I found nothing.

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kelseymh6 years ago
First hit on Google. Ferrous/ferric ammonium sulfate.
mad_scientist (author)  kelseymh6 years ago
Thanks. Do you know what it's used for?
So you didn't follow my broken link (which shoud have been to http://www.google.com/#sclient=psy&hl=en&q=Light's+solution), nor did you even type "Light's solution" into Google yourself. If you had done so, you wouldn't need to ask the question. So why don't you go and try it?
mad_scientist (author)  kelseymh6 years ago
Ouch. I assume your reference was to weissresearch.com (the first hit on google) which I had stumbled upon even before posting this question. Just because I can read the description doesn't mean I understand what it does. It appears to be used in calibration of some sort, but I would really appreciate if someone could clarify.
My apologies for posting a somewhat ambiguous question.

By the way, my apologies for not adding the necessary and intended smiley in my first sentence above. Of course you couldn't actually follow my link, which I didn't put into the text correctly.

Yes, my reference was to the Weiss Research link, but you can also see the second link, from Cole-Parmer.

Both links reveal that Light's Solution is used as an "oxidation-reduction potential standard". So you don't know what this means? Then you should continue reading and researching to get more information.

In particular, the fifth link on the very same Google search says (I've stripped out the nasty Google redirect):

Calibration method using a stable and safe redox standard solution ...

Light's Solution is not light-sensitive and is generally more stable than Zobell's Solution, but Light's Solution is so strongly acidic (pH about 0.3) that ...

www.patentstorm.us/patents/6350367/description.html - Cached - Similar

The first two paragraphs (under "BACKGROUND") give you an excellent summary of what a "redox standard" is, and why it is used. If you don't know what some of the terms in those paragraphs mean, you might cut and paste them into, for example, Wikipedia.

You could also have typed ORP into Wikipedia's search box, and the very first bullet would take you to "oxidation reduction potential," which you can follow and read to learn more.

Is this "Google" something new? I've never heard of it before. What does it do?
Well, it's sort of like Lycos, but bigger.
Does it teach you how to create links that work?

Aw, crud. Paste failure. However, I leave to your imagination the (highly successful) search term used.