Design an experiment

        You are provided with the following apparatus and materials:

                1 test tube rack with test tubes

                1 measuring cylinder

                1 knife

                1 large beaker/water bath

                1 hard-boiled egg

                solution of protein-digesting enzyme

                dilute hydrochloric acid

                dilute sodium carbonate solution

                distilled water

        Design an experiment to show that egg white is first digested by a protein-digesting enzyme in the stomach.

        Hints:

a.       At which temperature are you going to conduct your experiment?

b.      What is the pH of gastric juice?

c.       How are you going to record and present the results?

d.      How can you obtain faster results?

e.       What are the controlled variables ?

f.       What are the possible sources of errors ?