Thursday, November 10, 2011
As The Stomach Churns Lab: Part 2: Day 2
In class, we looked at the test tubes from the day before. Test tube A, the egg white clumped and froze. When we put a stirrer in and put it on the Litmus paper, nothing happened. Test tube B, the egg white is gone and the pepsin went to the bottom. When we put it on the litmus paper, it was like sugar on paper, then slowly dissolved into the paper, making it wet. Test tube C, nothing happened to the solution and when we put some on the litmus paper, the paper turned pink. Test tube D, the pepsin went to the bottom, and the acid went to the top, and the egg white shrunk. When we put some on the litmus paper, the paper turned pink.
Monday, November 7, 2011
As The Stomach Churns Lab: Part 1: Day 1
In class, we did a lab using egg whites and hydrochloric acid. We had four test tubes, A. B, C and D.
Each test tube had three pieces of egg whites. We also put something different on top of the egg whites in each test tube. In test tube A, we put 10 mL of enzyme pepsin on top of the egg whites. There was no immediate reaction in the egg white appearance. In test tube B, we put 5 mL of water, and 5 mL of pepsin. The egg whites started bubbling. In test tube C, we put 10 mL of hydrochloric acid. There was no immediate reaction. In test tube D, we put 5 mL of hydrochloric acid and 5 mL pepsin. The egg white was melting slowly. We then took stirrers then put them in each test tube then on to blue litmus paper. Test tube A solution, there was no immediate reaction. Test tube B solution, the litmus paper gets wet. Test tube C solution, the litmus paper turns pink, because when the hydrochloric acid touches blue litmus paper it turns pink. Test tube D solution, turns pink and for the same reason.
Each test tube had three pieces of egg whites. We also put something different on top of the egg whites in each test tube. In test tube A, we put 10 mL of enzyme pepsin on top of the egg whites. There was no immediate reaction in the egg white appearance. In test tube B, we put 5 mL of water, and 5 mL of pepsin. The egg whites started bubbling. In test tube C, we put 10 mL of hydrochloric acid. There was no immediate reaction. In test tube D, we put 5 mL of hydrochloric acid and 5 mL pepsin. The egg white was melting slowly. We then took stirrers then put them in each test tube then on to blue litmus paper. Test tube A solution, there was no immediate reaction. Test tube B solution, the litmus paper gets wet. Test tube C solution, the litmus paper turns pink, because when the hydrochloric acid touches blue litmus paper it turns pink. Test tube D solution, turns pink and for the same reason.
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