Today, May 11, in Mr. Wong’s Chemistry class, my lab group conducted an experiment where we were able to find the different pH values of solutions to create a spectrum. First, we created the full spectrum by using cabbage juice as the solvent in our solutions. We began by putting drops of acid into the cabbage juice to decrease the pH by about 1 each time by using a pH probe. Next we used a different solution with cabbage juice and put drops of a base in it to raise the pH by 1 each time. By taking a sample for each pH, we were able to make a full spectrum representing various pHs. The change in the pH of each solution also alters the color of each solution. The colors at one end (the bases) start dark blue and then become a lighter green. As the spectrum continues, it turns into a light pink and then to a dark purple (the acids). The spectrum represents the change in color, hydrogen ions, and pH.
Here are our tables:
Here are the corresponding graphs: