Ingredients: 1% solution of timolftaleina in ethanol, 0.5 M NaOH solution
What You Need: straw, beaker
How it works: Add a few drops of the NaOH solution until the solution is not timolftaleina asssume a deep blue, the timolftaleina is an acid-base indicator that takes the blue color in the basic form and has no color in the form acid. Pour the ethanol solution of timolftaleina in a glass. Blowing through a straw into the solution, the carbon dioxide in our breath acidify the solution by the turn timolftaleina. The blue solution becomes colorless. 
0 comments:
Post a Comment