Today we did an experiment where we used cabbage juice an indicator to tell us whether a substance was either an acid or base.
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| Photo courtesy of www.chemistryland.com |
This lab went relatively well I thought, but I would just like to point out that there were no neutral substances being tested. Some of the groups thought hydrogen peroxide was neutral because it was purple but the shade of purple was different than that of the cabbage juice. Since it is only a slightly different color purple this means that hydrogen peroxide is ever so slightly acidic.
Today's lab should have showed you the wide range of pH levels found in everyday household items. Below is a diagram of the pH scale using the colors of the cabbage juice to let you see the approximate pH of each substance. This scale is a bit better than the one I showed in class today.
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| Photo courtesy of http://braukaiser.com |
Tomorrow and Wednesday we will be reviewing a lot of material in order to prepare you for your cumulative chemistry final on Thursday and Friday. There is a lot of material to cover and it would be helpful if you brought in all your old tests and handouts so we can go over any questions you might have on the material.
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