Name:____________________________ Date:________________ Period______

Problem: What does diastase do to starch?

Procedure:

1.Using a spot plate, place 5 drops of starch solution in each of the 13 wells. Making sure to keep things as clean as possible so as not to contaminate your equipments. ( The large long well will be your control)

2. Place a clean sheet of white paper under the spot plate.

3. To each of the 12 round wells that already have starch solution to them, add a tiny scoop of diastase powder and stir the mixture. ( DON'T ADD ANY TO THE LONG WELL- REMEMBER IT IS YOUR CONTROL)

4. Using a clock with a second hand, time it for two minutes.

5. At the end of two minutes add one drop of iodine to the first well. Record your observations.

6. At the end of another two minutes add one drop of iodine to the second well and record your results.

7. At two minute interval, add one drop of iodine to the other wells and record your results.

8. Make sure that you clean your equipment before you leave the lab.

Questions:

1. What does the iodine test for?

2. What color do you see if there is a positive test using the iodine?


3. What did the diastase do to the starch?


4. What do you thing happened to the starch?



5. Where do WE use this chemical diastase?


6. What chemical test could you do to find out exactly what the diastase turned the starch solution into?