The “Elephant Toothpaste” experiment is a very popular, albeit messy chemistry demonstration. To carry out this experiment, place a 250 mL graduated cylinder on something that you wouldn’t mind getting messy. Next, add 75 – 100 mL of 30% hyd
I expect that most high school chemistry teachers assign some type of laboratory related to types of chemical reactions including synthesis, decomposition, single replacement and double replacement reactions. I have used several published versions, but I am sharing my modifications.
20 minutes prep, 40 minutes laboratory, 15-20 minutes discussion
The conductivities of a sulfuric acid solution and a barium hydroxide solution are tested, and will be the basis for monitoring a simple titration.
As a barium hydroxide solution is added to a sulfuric acid solution, the solution's conductivity gradually decreases. When the acid is consumed, the conductivity approaches zero, then rises again as more base is added.