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Home Q & A Board Biology-Related Homework Help Biochemistry
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lenny63 lenny63
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11 years ago
In the lab experiment, we added HCl to starch and shook and boiled it. And then we put a drop of it in iodine 'to test for a polysaccharide'.

In the second part of the experiment of it we put it with naOH and added Benedict solution 'to test for reducing sugars' and then we boiled it for two minutes..

Can someone tell me why we did this and what happened to the substances? (the result of the experiment)
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#1
11 years ago
when u add HCL to starch the glucosidic linkages break down to give its monomers glucose units, when u add iodine if the total starch molecules are broken down, it wont turn blue.

when u perform benedicts test u can differentiate whether the given sugar is a reducing or non-reducing , reducing sugars have a free OH grp
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#2
11 years ago
If you don't know why you did this and need someone to tell you, perhaps it's not a chemistry class you need, but an alzheimer's meeting.
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