Treating Starch Coursework

HideShow resource information
  • Created by: Zaara
  • Created on: 05-04-13 16:23
Preview of Treating Starch Coursework

First 325 words of the document:

Planning for the investigation; Treating Starch.
Hypothesis: - Starch will break down at pH 6 and 7, faster than if you use the other pH.
Independent Variable:
The different concentration, of the buffer solution. Another independent variable is the amount of
mixture you use, so amylase, starch, the buffer solution.
Dependant Variable:
Time taken, for the mixture for to stay orange.
Range of Data:
pH concentration of 2, 4, 5, 6, 7, 8 and 10.
Controlled Variable:
My investigation, will keep the amount of iodine solution drops the same. Another variable, I will
keep the same is the amount of drops, of the pH concentration. I will keep the amount of amylase
and starch, each time, used in the investigation.
Equipment:
2 Tiles
2 Beakers
1 Test tube
1 Stopwatch
Iodine Solution
1% Amylase
1% Starch
3 Pipettes(Same Scale)
pH Concentrations 2, 4, 5, 6, 7, 8 and 10.
Accuracy: I will make my results accurate by, using a stopwatch, which is to two decimal points.
Precise Data: The results will be similar, as I will use the same amount of iodine solution,
throughout the investigation.
Resolution: I will utilise a pipette, which will allow me to measure, to an accurate scale.
Reliability; I will repeat my results 3 times and eventually work an average.
Method:
1. take out, all equipment needed for investigation and check if they all work.
2. Put three drops, of the iodine solution, in rows on the 2 tiles.
3. Once completed, label the first test tube, with the pH to be tested.
4. Then, get the syringe and add 2 cm³ of amylase into the test tube.
5. Next, add 1 cm³ of buffer solution to the test tube, using a syringe.
6. Using another syringe, add 2cm³ of starch to the amylase/buffer solution. Start the stop
watch, and leave it on during the test. During the test, mix using a plastic pipette.

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

After 10 seconds, use the pipette to place one drop of the mixture onto the first drop of
iodine. The iodine solution should turn into a black-blue colour. Squirt the rest of the
solution, back into the test tube.
8. Wait another 10 seconds. Then add a second drop of the mixture, to the next drop of iodine.
9. Repeat step 8 until the iodine solution and the amylase/buffer/ starch mixture stay orange.…read more

Comments

No comments have yet been made

Similar Science resources:

See all Science resources »See all resources »