How long does an iodine clock reaction take?
about 5 minutes
With stirring, quickly add each solution to the 400 mL beaker. The solution will oscillate between colorless, amber and dark blue. Clock will oscillate for about 5 minutes typically.
What happens in the iodine clock reaction?
This clock reaction uses sodium, potassium or ammonium persulfate to oxidize iodide ions to iodine. Sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color.
Why does the iodine clock work?
The main assumption is that the blue color is trapped or hidden by the bags. In an iodine clock reaction, the blue color is due to the starch–iodine complex, but the compound that is “trapped” by thio sulfate ions is iodine itself, which is reduced back to colorless iodide ions.
Why is it called iodine clock?
During the reaction, two clear liquids are mixed, resulting in another clear liquid. After some time, the solution suddenly turns dark blue. The reaction is called a clock reaction because the amount of time that elapses before the solution turns blue depends on the concentrations of the starting chemicals.
Why does iodine clock reaction happen?
In Reaction # 1 iodide ions react with hydrogen peroxide to produce iodine element which is blue in the presence of starch. BUT, before that can actually happen, the Vitamin C quickly reacts and consumes the elemental iodine.
Why is iodine clock reaction used?
This demonstration can be used at secondary level as an introduction to some of the ideas about kinetics. It can be used to stimulate discussion about what factors affect the rate of reaction. It also makes a useful starting-point for a student investigation.
Why is there a delay in iodine clock reaction?
The starch is trying to turn the iodine blue, but the Vitamin C is battling the starch. This causes a delay in the reaction. Eventually, the starch defeats the Vitamin C and the color change occurs. The delay is the reason it’s called a clock reaction.
What happens when you mix iodine and vitamin C?
If vitamin C is present, the brownish color of the iodine solution will become colorless — the vitamin C serves as a reducing agent and reduces iodine to iodide ions (colorless in solution). If there is no vitamin C (or very little), the blue-black coloration appears immediately.
What color does iodine turn your skin?
While iodine can be an effective treatment, it can leave unsightly red or brown stains on your skin. These stains usually fade away on their own after one to two months, but you can get rid of them fast by applying rubbing alcohol to the area.
What happens when you mix bleach and iodine?
Iodine ions, I–, from the potassium iodide solution react with the bleach to produce elemental neutral iodine, I2, and chloride ions. Iodine is an amber color. Iodine reacts with starch to form the familiar dark blue starch–iodine complex.
Can you take iodine with orange juice?
Take strong iodine in a full glass (8 ounces) of water or in fruit juice, milk, or broth to improve the taste and lessen stomach upset. Be sure to drink all of the liquid to get the full dose of medicine.