Chapter14: Formula Method
Section: Chapter Questions
Problem 7SST
Related questions
Question
Using my chart can you help me answer this question?
Why did we select distilled water to be the negative control?
Transcribed Image Text:B. IODINE (IKI) TEST FOR STARCH
Pos or
Neg
Control
1
2
3
4
Control/Standard
Sample
1
¹ Distilled Water
2
3
Glucose
Starch
Unknown
Coconut Mille
Heavy Cream.
Whole Milk
Prediction
ست
t
+
+
End
Color
yellow
Yoller
tau
black
Orange
Orange
orange
Starch
Present (+)/
Absent (-)
-
Expert Solution
Step 1
Negative controls are used to establish a baseline or reference point for comparison with other samples in the experiment. In the case of distilled water, it is used to establish the absence of any effect or change that may occur due to factors other than the variable being tested.
For example, if you are conducting an experiment to test the effect of a new chemical on plant growth, you may use distilled water as a negative control to ensure that any observed effects on plant growth are due to the chemical being tested and not to any contaminants or substances present in the water used for the experiment.
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