We did a fun experiment today using Bromothymol Blue (BTB), which is a chemical that changes color when exposed to acids or bases.  I purchased it on Amazon.com from a chemical supplier pretty inexpensively, and you only need to use a little – just put a small amount in a cup and add water. To set up the experiment, I set out several clear plastic cups and got out our various supplies.  I filled the cups half full with the BTB / water mixture and then let the kids take turns adding things to see what would happen.  The older kids created a table toRead More →