What role does Ki play in the decomposition of hydrogen peroxide?
This is another great demonstration to illustrate the effect of the breakdown of H2O2 to H2O and O2: Page 3 KI catalyzes the decomposition of hydrogen peroxide to oxygen and water. Since KI is a catalyst it is not consumed in the reaction.
What happens when hydrogen peroxide react with KI?
Hydrogen peroxide 30% in a large round flask decomposes to boiling water and oxygen when postassium iodide is added. When the KI hits the hydrogen peroxide, it changes color to brown as the active catalytic form of the iodide is formed.
What is the role of potassium iodide in this reaction?
KI (potassium iodide) is a salt of stable (not radioactive) iodine that can help block radioactive iodine from being absorbed by the thyroid gland, thus protecting this gland from radiation injury. The thyroid gland is the part of the body that is most sensitive to radioactive iodine.
What is the indicator used in iodide persulfate reaction?
Persulfate variation 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.
Does Ki react with oxygen?
Stock solution 1.0 M potassium iodide, KI: Dissolve 33.2 g KI in 160 mL distilled water – dilute to 200 mL. (The iodide ions in this solution will be oxidized slowly by oxygen in the air. The product is molecular iodine, I2, which darkens the solution.
How do you test the decomposition of hydrogen peroxide?
Hydrogen peroxide decomposes to produce oxygen gas and water. The reaction can be catalysed by yeast. One way of measuring the rate is to time how long it takes for a disc of filter paper to rise a specific distance in a test tube containing hydrogen peroxide solution.
What type of reaction is H2O2 and Ki?
K959: Catalysis – KI catalyzed decomposition of H2O2 (“Giant Snake”) The reaction of hydrogen peroxide with potassium iodide is demonstrated in a tall cylinder.
Which indicator is used in iodometric titrations?
starch solution
In an iodometric titration, a starch solution is used as an indicator since it can absorb the I2 that is released. This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with standardised thiosulfate solution.