kjslugger

Thank you for the info. I know that vinegar and B. Soda is a quick reaction. I have not taken it past that point and removed the water to get sodium acetate. I will have to try it this week before I see students. Thanks for the help!

Thanks for the suggestion! If the acetic acid (vinegar) is added slowly enough, not sure you get many bubbles of CO2. They need to do a burning splint test for CO2. How long does it take to remove water from sodium acetate? Class is only 50 min long, but realistically 35-40 min of lab time figuring setup and cleanup.

Hi, I have been trying to write up a new procedure for chemistry lab and need some help. I am looking for some chemical reactions that students can do that show evidence of a color change or a temperature change (hot or cold) or gas evolution or a precipitate that has color (preferably not white). I can not use mercury, lead, chromates. I have mostly nitrates, chlorides and some sulfates to work with. I have already done experiments with Mg and HCl for H2 creation. Copper and Silver Nitrate - too expensive! Calcium chloride and sodium carbonate for precip. Magnesium burning. Copper Carbonate decomposition for CO2. I don't really have any good experiments for colored precipitate formation or temperature change or oxygen gas evolved. Can anyone suggest ones they have done in high school chemistry? I teach HS chemistry in AZ. Thanks, Kjslugger