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Positive control = starch, what is the negative control?

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#1 BrandonG1394



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Posted 31 October 2014 - 12:00 PM

Teacher want's us to choose a negative control for this and I have no Idea.


  1. Set up a positive control for this experiment by spraying a paper towel with the starch solution. Allow the starch to dry for approximately one hour (this time interval may vary by local humidity).
  2. In the mean time, set up a negative control for this experiment. Use your knowledge of the scientific method and experimental controls to establish this component (hint: what should happen when IKI solution contacts something that does not contain starch?) Identify your negative control in Table 1.
    Note: Be sure to space the positive and negative controls apart from each other to prevent cross-contamination.

the full experiment can be found here:






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Posted 31 October 2014 - 01:09 PM

so your negative control should be something that doesnt have starch, right? first find, what is starch? then you can easily find the negative ctrl.


 think very basically what all does/doesnt have starch, start from water, does it?  meat does it? or vegetables ? plastic ? ask yourself you can find it.

I always had an alternate hypothesis....

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