10 Questions
What is the purpose of adding a base like NaOH prior to the addition of the oxidizer in cyanide destruction by chlorine?
To increase the pH to about 10.5
What is the final product formed when cyanide is oxidized by chlorine?
Carbon dioxide (CO2) and nitrogen gas (N2)
What is the chemical equation for the reaction between cyanide and hypochlorite?
CN⁻ + OCl⁻ + H₂O → CNCl + 2OH⁻
What is the maximum cyanide removal efficiency that can be achieved by chemical oxidation using chlorine?
Up to 99.9%
What is the advantage of using ozone for chemical oxidation compared to other oxidizers?
Ozone reactions are extremely fast
Why is ozone produced on-site for chemical oxidation processes?
Due to ozone's high reactivity and instability
What is the name of the reagent formed when hydrogen peroxide is used in the presence of ferrous iron for chemical oxidation?
Fenton's Reagent
What is the reactive species formed by Fenton's Reagent that facilitates oxidation?
Free hydroxyl radicals (OH•)
At what pH range are ozone reactions most effective for chemical oxidation?
Acidic pH
What is the final product formed when cyanide is oxidized by chlorine, according to the balanced chemical equation provided?
Cyanate ion (CNO⁻) and hydrochloric acid (HCl)
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