by Hillary, Nicole, Kate, Emily, and Sara
Determining color range
We learned a lot throughout the process of using the blackberry as an indicator for our project. Blackberries, when mashed, create a very thick, dark red, liquid. Because the indicator is not a liquid, it was harder for the indicator to mix with the other substance to create one color. The test tube consisted of a very thick solution and most of our tubes looked a dark red - purple color. In past labs, we worked with substances that were not natural, so the two liquids were easy to mix, but because the blackberry is a natural substance, it was harder to create one liquid.
Our indicator was better at detecting bases than acids.
While using our natural indicator there were a few problems. We blended blackberries and the result was a very thick consistency. When we went to add drops of the indicator to the household substances it was a little hard to get the indicator into them. Our indicator stayed at the top of the test tube while the household substance was still at the bottom. Over time, the indicator spread out and allowed us to see the new color but it still wasn’t as accurate as it could have been. When we were judging the pH’s some of were very similar in color. We named them the best we could but it still left room for error. If we were to do this test again, adding more water to thin out the indicator would be beneficial.