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In the relevant reaction, hydrogen peroxide reacts with the hemoglobin in the blood. Phenolphthalein does not directly participate in this process; instead, it acts as an external source of electrons. In its reaction with hydrogen peroxide, the heme center of hemoglobin behaves as a peroxidase, reducing the peroxide to water. This activity ...
Removal of blood stains. Hydrogen peroxide reacts with blood as a bleaching agent, and so if a blood stain is fresh, or not too old, liberal application of hydrogen peroxide, if necessary in more than single application, will bleach the stain fully out. After about two minutes of the application, the blood should be firmly blotted out. [84] [85]
Household bleach generally removes a stain's colour, without dissolving the stain itself. Hydrogen peroxide is also a bleaching agent that can be used to treat stains. [3] Sodium perchlorate is a bleach alternative.
A sterile cotton swab is soaked in distilled water and applied to the area of suspected blood to pick up some of the sample. [5] One drop of alcohol is applied to the swab, followed by the addition of one drop of the phenolphthalein reagent, followed by one drop of hydrogen peroxide. [6] A positive result induces a color change to pink. [4]
Vinegar and Hydrogen Peroxide Hydrogen peroxide is good for disinfecting and may be in your first aid cabinet and your cleaning kit but combining it with vinegar is asking for trouble.
In the presence of a catalyst such as an iron or periodate compound, the hydrogen peroxide decomposes to form oxygen and water: 2 H 2 O 2 → O 2 + 2 H 2 O H 2 O 2 + KIO 4 → KIO 3 + O 2 + H 2 O. Laboratory settings often use potassium ferricyanide or potassium periodate for the catalyst. In the forensic detection of blood, the catalyst is the ...