ACIDS AND BASES
PROBLEM:How can you find out if a solution is an acid or base?
MATERIALS: universal test paper, phenolphthalein solution, bromothymol blue solution.
Using the test solutions and indicator paper, determine whether the test solutions are acids or bases. Determine the pH using the indicator test paper and then use the indicator solutions to see if a color change occurs.
1. Add 100 mL of water to a 250 mL beaker.
2. Add a few drops of phenolphthalein indicator solution to the beaker
3. Add a few drops of ammonia to the beaker and stir. If the color doesn't change, repeat.
4. Once the color changes, add a few drops of vinegar and stir. If the color doesn't change, repeat.
5. Once the color changes, add a few drops of bromothymol blue and stir. If the color doesn't change, repeat.
6. Now add a few drops of ammonia and stir. If the color doesn't change repeat.