In gen chem we demonstrate the wonders of a precipitation reaction using the very nice, very visual, and very un-green Lead Nitrate + Potassium Iodide demo. I like it because the reaction is VERY easy even for beginning students to write the equation of, and demonstrates the solubility rules very nicely by making two clear solutions form a spectacular yellow ppt! I dislike it because I make two large graduated cylinders full of PbI2 (you can't do a demo just once!). Anyone have a similar ppt reaction with (preferably inexpensive) inorganic salts that makes nice colors and comes with an easily written ionic equation that does not use lead salts (or something worse)?
October 27, 2008 - 9:05pm#1