Glucose Concentation Experiment (Lab Report)
RESEARCH QUESTION
How does the glucose concentration effects the time taken for the potassium permanganate to decolourise from purple to colourless ?
HYPOTHESIS
The higher the glucose concentration the shorter the time taken for the potassium permanganate to decolourise from purple to colourless.
VARIABLES VARIABLE | UNITS | RANGE | METHOD FOR CONTROL | INDEPENDENT VARIABLE-Concentration of glucose solution | % | 5%10%15%20%25%30% | Different glucose concentration are tested | DEPENDENT VARIABLE-The time taken for the potassium permanganate to decolourise from purple to colourless | second (s) | - | Measure the time taken for the potassium permanganate solution to decolourise from purple to colourless by using stopwatch |
CONTROLLLED VARIABLE | UNIT | METHOD FOR CONTROL | Concentration of sulphric acid | molarity (M) | Use the sulphric acid with the same concentration for the all sample | Volume of sulphric acid used to test each sample of glucose concentration | cm3 | Use the same volume of sulphric acid to test each sample of glucose concentration that is 5cm3 | Volume of potassium permanganate used to test each sample of glucose concentration | cm3 | Use the same volume of potassium permanganate to test each sample of glucose concentration that is 2cm3 | Volume of different glucose concentration used in every test | cm3 | Use the same volume of different glucose concentration in every test that is 10cm3 | The volume of unknown solution used in every test | cm3 | Use the same volume of each unknown solution in every test that is 10cm3 |
APPARATUS AND MATERIAL APPARATUS | QUANTITY | Eye protection | 1 | Stopwatch | 2 | Boiling tube and rack | 9 | Beaker (100ml) | 3 | Measuring cylinder (50ml) | 1 | Label | 9 | Glass rod | 1 | Syringe | 3 |
MATERIAL | QUANTITY | Glucose solution with different concentration | 60cm3 | Sulphric acid (1M) | 45cm3 | Potassium permanganate | 18cm3 | 3 unknown solution | 10cm3 for each
How does the glucose concentration effects the time taken for the potassium permanganate to decolourise from purple to colourless ?
HYPOTHESIS
The higher the glucose concentration the shorter the time taken for the potassium permanganate to decolourise from purple to colourless.
VARIABLES VARIABLE | UNITS | RANGE | METHOD FOR CONTROL | INDEPENDENT VARIABLE-Concentration of glucose solution | % | 5%10%15%20%25%30% | Different glucose concentration are tested | DEPENDENT VARIABLE-The time taken for the potassium permanganate to decolourise from purple to colourless | second (s) | - | Measure the time taken for the potassium permanganate solution to decolourise from purple to colourless by using stopwatch |
CONTROLLLED VARIABLE | UNIT | METHOD FOR CONTROL | Concentration of sulphric acid | molarity (M) | Use the sulphric acid with the same concentration for the all sample | Volume of sulphric acid used to test each sample of glucose concentration | cm3 | Use the same volume of sulphric acid to test each sample of glucose concentration that is 5cm3 | Volume of potassium permanganate used to test each sample of glucose concentration | cm3 | Use the same volume of potassium permanganate to test each sample of glucose concentration that is 2cm3 | Volume of different glucose concentration used in every test | cm3 | Use the same volume of different glucose concentration in every test that is 10cm3 | The volume of unknown solution used in every test | cm3 | Use the same volume of each unknown solution in every test that is 10cm3 |
APPARATUS AND MATERIAL APPARATUS | QUANTITY | Eye protection | 1 | Stopwatch | 2 | Boiling tube and rack | 9 | Beaker (100ml) | 3 | Measuring cylinder (50ml) | 1 | Label | 9 | Glass rod | 1 | Syringe | 3 |
MATERIAL | QUANTITY | Glucose solution with different concentration | 60cm3 | Sulphric acid (1M) | 45cm3 | Potassium permanganate | 18cm3 | 3 unknown solution | 10cm3 for each
References: 1. The 12th Edition of Student’s Handbook For Biology HL (Year 1/2012) of College MARA Banting (page 179 - 181) 2