1. The pH meter - It is an electronic device that shows a numerical value of how acidic or basic a solution is. It is accurate and fast, but is also relatively expensive.
2. The Indicator Paper - It is an ordinary filter paper that changes colour when the concentration of hydrogen ions reach a certain level.
3. The Indicator Solutions - The different indicator solutions change colour at a specific pH.
We also had a lab today. It is the prettiest lab that we did and will do, as Mrs. Kozoriz noted. (And yes, it really turned out beautiful!) We placed 10 drops of distilled water in column numbers 2-11 and added either HCl or NaOH to the rows. And then, using the indicator solutions that were provided to us, we witnessed the transformation of colours in each of the wells of our well plates.
After the fun, we had four questions to answer:
1. What is the significance of the colour changes in each row?
2. Which would be a good indicator for general use?
3. Which would be a good indicator for a HCl/NaOH titration?
4. Which would be a poor indicator for a HCl/NaOH titration? Why?
Labs are due tomorrow! I choose Marie as the next scribe :)
1 comment:
Thanks for posting. You covered what we did in class very well. I really like the photo.
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