In science class, we did a lab. The purpose of this lab was to see what conditions are needed for the digestion of proteins in the stomach. We needed a lot of supplies for this lab, including a test-tube rack, test-tubes, pepsin, water, cubes of boiled egg whites, and many more. On the first day, we labeled 4 test tubes A, B, C, and D, and put 3 pieces of egg white in each of them. In test-tube A we put pepsin. In test-tube B, we put pepsin and water. On C, we put hydrochloric acid. Finally, we put pepsin and the acid in D. Test-tubes A and B had immediate reactions, while C and D didn't. The litmus colors were purple for A, blue for B, and pink for C and D.
On day two, we saw that nothing happened to A, B had dissolved to the bottom of the test-tube, and nothing much happened to C and D. The litmus colors were all the same. The only difference was that B's color was purple rather than blue.
