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Answer to Question #1405 in Biochemistry for Olivia

Question #1405
How can you detect the presence of chlorine in a pesticide?
Expert's answer
For example, the reaction of aqueous NaOH with the chlorine yields sodium hypochlorite and sodium chloride NaCNO NaCl:
Cl2 + 2 NaOH = NaClO + NaCl + H2O
Then silver nitrate AgNO3 should be added:
NaCl + AgNO3 = NaNO3 + AgCl (insoluble white sediment) - it's characteristic reaction of chlorine presence.

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