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Why you use iodine to test the presence of starch but why not other chemicals?
Wiki User
∙ 10y ago
Because it call sense the difference between a base and an acid.
Wiki User
∙ 14y ago
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Does milk contain starch?
it contains protein,calcium,fat and other minerals
Is mercurochrome the same as iodine or what is the difference.?
No, they are both antiseptics, but their chemical nature is different. Iodine solution contains the element iodine as its active ingredient. Mercurochrome is one of the names for merbromin, a salt of a polycyclic compound.
What is the function of an apron in science?
to protect you from getting chemicals and other substances on to your clothes and skin.
What are example of a plant experiment?
You can make a maze for the branch or branches of the potato to grow out of the box. Put your potato in a shoebox at the very end with some fertilizer, and a hole at the other end. Then put obstacles in the box, so your potato branch can make its way through the hole. You can also identify something that has starch. To find out if that thing contains starch, you have to put iodine on it, and see if the thing changes into a blue to purpleish colour.
Starch is dissolved in which solvent?
Cold water. It is only slightly soluble in hot water. It is partially soluble in some organic liquids such as methanol and acetone.-----------------------------------N-methyl morpholine N-oxide (NMMO) is direct solvent for cellulose and other polysaccharides such as starch.
What is idodine stain?
It is either iodine and it stains starch, or the other way around, starch that stains iodine, likely the former as it is biological. Starch or iodine can be used in chemical titrations also to indicate the presence of the other available in solution.
What regent would you add to starch agar plate to detect starch hydrolsis?
To detect starch hydrolysis on a starch agar plate, you can add iodine solution. Iodine reacts with starch to form a blue-black color, and if starch is hydrolyzed by the organism, the clear zone around the bacterial growth will indicate the presence of amylase, an enzyme that breaks down starch.
Add a drop of iodine to both a distilled water test tube and to the test tube containing the starch solution in the test tube What do you observe?
The starch solution will turn black, while the distilled water will remain brown, the same colour as the iodine. This is actually because water, normally used as a control, does not contain any starch and as we know, the iodine test is highly specific for the presence of starch hence no colour change other than iodine dissolving in water to form an iodine solution contrary to starch which we know complexes with iodine, to form starch-iodine complex forming the blue-black colour observed
What compound is identified by the use of iodine?
Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil. This makes a linear triiodide ion complex with is soluble. The triiodide ion ion slips into the coil of the starch causing an intense blue-black color. Iodine added to a solution or directly on a potato or other materials such as bread, crackers, or flour will produce a blue-black color results if starch is present. If starch amylose is not present, then the color will stay orange or yellow.
Which reacts to iodine glucose or starch?
Starch turns blue when Iodine is introduced. Added: Though it's not quite a chemical reaction, Iodine will give starch a bluish purple color but it stays chemically UNchanged. Iodine stays reddish brown with glucose and many other oligosaccharides (up till about 10 to 15 monomeric glucose units)
When a certain sugar is tested with an iodine solution can you tell what type it is?
It depends if it is starch, yes. Other sugar, NO!
What makes corn colorful?
different levels of starch and other chemicals, or old age.
Why do you need to remove chlorophyll from a leaf when testing for starch?
Chlorophyll has a function of converting starch into glucose and other simpler plant products.Thats why we have to remove cholorphyll before starting a test for starch.
What does idione do for you body?
Iodine is an essential trace mineral in which the thyroid uses it secrete hormone regulating chemicals and contributes to the initializing of numerous metabolic processes.. Iodine is also a great detoxifier of chemicals and help utilize other vitamins and minerals such as calcium. Iodine deficency is very common today to the modern diet.
What is in iodin that makes thines blue?
Its the electrons! Iodine forms a "charge transfer" complex with starch which is ythebest known of its charge transfer complexes. It also forms charge transfer compexes with other compounds which are not blue. In iodine the charge transfer occurs because of an electonic transition (that causes the color), this causes a small amount of charge to move from the iodine molecule to the starch.
What is an experiment for starch digestion?
The first step in the digestion of starch is the mouth mashing up the starches. Next, the stomach acids break down the starches. Then it passes to the small intestine where dextrinase and glucoamylase further break down the starches. Several enzymes are released from the pancreas into the small intestine to finish breaking down the starches.
How might the size of the membrane pore compare to the size of the starch molecules?
In other words this question asks if the pores are bigger or smaller than the iodine molecules. So.... the answer is that the iodine are smaller than the pores and the pores are bigger, because the iodine molecules need room to pass through, and the pores are not selectively permeable because they let the iodine through.
