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File-019 - BIO 119 File-019 McCague Exercise XV Purpose To...

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BIO 119 McCague File-019 Exercise XV Purpose: To study saliva. Materials: 1. Saliva 2. 2% Cooked starch solution 3. Fehling’s or Benedict’s solution 4. Test Tudes, funnels, and graduates 5. Slides and droppers 6. Filter paper 7. Paraffin 8. Methylene Blue 9. Dilute acetic acid (C 2 H 4 O) 10. Litmus paper or a suitable indicator 11. Dilute nitric acid 12. 2% Silver Nitrate (AgNO 3 ) Procedure: 1. Have each student well chew a little paraffin or wax and introduced the fresh sample of saliva into a filter paper lined funnel. The saliva in the funnel will be referred to as unfiltered, the saliva in the receiving graduate will be referred to as filtered. 2. Place a drop of unfiltered saliva on a slide and drop of methylene blue. Cover with a cover glass and examine under the microscope. Draw the main structures observed under low power and under high power. 3. To 2 cc. of filtered saliva add a few drops of dilute nitric acid. Mix, add a few drops of 2% AgNO 3 . What is the precipitate?
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File-019 - BIO 119 File-019 McCague Exercise XV Purpose To...

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