Optional: using what you learned in this activity and in pbs, write a hypothesis about the conditions (enzyme, temperature and ph) required for the digestion of proteins in the stomach. outline a controlled experiment that tests your hypothesis. your materials and equipment include: distilled water, pepsin solution, hydrochloric acid (hcl), sodium hydroxide (naoh), ice, beakers, a bunsen burner, thermometer, ph strips, albumin (a protein), biuret reagent (an indicator for proteins), test tubes and various glassware. you may use the internet or resources from pbs to complete this task. be clear about how the results will prove/disprove your hypothesis.