Just a guess, but how about calcium chloride and ammonium carbonate (to give calcium carbonate, chalk, and ammonium chloride)?
A choice is to do a different kind of double displacement reaction. For example, copper sulfate with sodium hydroxide is known to form a blue precipitate. These chemicals have other hazards that need to be considered.. You can check their SDS or look them up in the Rehab Lab site.
This link is nice to have and a great reference. In my opinion, please remember that perusing various SDS (from different vendors) for the chemicals is always best!
Yamaira I. Gonzalez, PhD
> >What I was wondering is if you knew off the top of your head any easily obtainable guidelines that recommend against using it in K-12 labs.
One place to look for this information is the "Rehab the Lab" web site hosted by the King County, Washington's Local Hazardous Waste Management Program. See
Included on this site is a database of about 1000 chemicals that have been found in high school labs over the last 20 years, what they might have been used for, and an opinion from a group of science educators as to what grade level they appropriate to use for. Lead Nitrate is listed as "high school" for lowest grade level and "lead iodide" isn't listed, although "Lead Diiodide" is as "High school w/ chemical hygiene officer approval".
Perhaps this information is helpful.
Ralph Stuart, CIH
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