1.

Give the balancedequation for the reaction between chlorine with cold NaOH and hot NaOH.

Answer»

Solution :Reaction with alkali: Chlorine reacts with cold dilute alkali to give CHLORIDE and hypochlorite while with hot concentrated alkali CHLORIDES and CHLORATES are formed.
`Cl_(2)+H_(2)O rarr HCl +HOCl`
`HCl+NaOH rarr NaCl+H_(2)O`
`HOCl +NaOH rarr NaOCl+H_(2)O`
overall reaction
`Cl_(2)+2NaOH rarr underset("Sodium HYPO chlorite")(NaOCl) + NaCl+H_(2)O`
`(Cl_(2)+H_(2)OrarrHCl+HOCl)xx3`
`(HCl+NaOH rarr NaCl+H_(2)O)xx3`
`(HOCl+NaOH rarr NaOCl+H_(2)O)xx3`
`3NaCl rarr NaClO_(3)+2NaCl`
overall reaction
`3Cl_(2)+6NaOH rarr NaClO_(3)+5NaCl+3H_(2)O`


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