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  1. Calcium chloride with carbonates of sodium, potassium or other alkali metal carbonates. Forms calcium carbonate which is calcite. It is only a white powder, but much safer. Iodide with lead is bright yellow but lead around children is typically frowned upon. potassium Ferrous and Ferric cyanate make a dark blue when mixed, but that is not an easy precipitation reaction to use as an introduction ionic reactions. It is more related to oxidation states.
  2. odd event during lead nitrate with sodium iodide makes lead iodide I was having my students do the above lab when they ran out of time. I had them start filtering the precipitate in plastic funnels and covered the funnels with copier paper to keep anything from falling into the funnels to add weight to the solids. When I came back over the weekend the copier paper was still in place and the filter papers were dry but the copier paper had a blue to dark blue circle where it was covering the funnel. Any idea what caused the color change on the copier paper? The lead nitrate was made
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