NaClO3 + H2O + HCl=>

Question

what form is the Cl in ?
I know that a gas is formed but the reaction that I did also had Cl reacting with the reactants so I'm not sure in what form of Cl did my reactant react with the product of the above reaction.

Thanks

Answer 1

This is a popular lab method used to generate small amounts of Cl2 gas. I mix it up (solid sodium chlorate + liquid conc HCl), wait a few seconds, then add H2O to make chlorine water (basically just water saturated with Cl2 gas). The Cl in ClO3^- is reduced to Cl2 gas and the Cl in HCl is oxidized to Cl2 gas. Then I can use the Cl2 water to oxidize Br^- to Br2 or I^- to I2 (for qual test on bromide and iodide salts) etc. I don't know what you had it mixed with but I don't think there are any side reactions.

Answer 2

I was doing a reaction to substitute Cl into 4-bromoacetanilide to form

I think it would be Cl-Cl reacted with acetic acid to form a complex of
Cl-Cl-COOHCH3

Cl-Cl-COOHCH3 + 4-bromoacetanilide => HCl + CH3COOH + 4-bromo-2-chloroacetanilide

week 3 experiment
suspend 500mg of 4-bromoacetanilide in magnetically stirred solution of 1ml of concentrated HCl and 1.3ml glacial acetic acid contained in conical vial. Heat untill homogenous if necessary then cool to 0C. Prepare a solution of 150mg of sodium chlorate in 0.5ml of water.
Use inverted funnel to catch fumes.(Cl gas) The slowly add the sodium chlorate solution dropwise to the stirred cold mixture over 2 min, some Cl gas is evolved. Stir reaction for 30 min after and then collect precipitate.

Thanks