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Starch is made up of a long chain of glucose molecules held together by glycosidic bonds. As you might know already, glucose is basically a bunch of things stuck to a six-member ring. One carbon in the ring is bound to an oxygen which is bound to the carbon of another ring: this is the glycosidic bond. This C-O-C bond, an ether linkage, can be broken through hydrolysis to release the constituent glucoses.

Hydrochloric acid puts H+ in your solution. The lone pairs of the oxygen in the C-O-C bond will attack this H+. Now oxygen is bound to three things; it is unstable. Because acid allows this destabilization to occur, it lets hydrolysis of the bond occur. This is not unique to hydrolysis of starch--other ether can also be cleaved by mineral acids like HCl, HI, or HBr.

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15y ago
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11y ago

The hydrolysis of starch with an acid is done to reduce sugars. This is usually done in as an experiment in school to show the conversion of starch into a sugar.

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Q: What is the effect of hydrochloric acid on starch?
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Effect of Hydrochloric acid on starch?

Starch is made up of single glucose molecules and it is a long-chain polysaccharide. Hydrochloric acid turns starch into disaccharides and monomers of glucose.


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