Precipitation reaction ion separation by fractional

We have described the precipitation reactions that occur when solid AgN03 is added slowly to a solution that is 0.0010 M in Cl", Br", and I". Silver iodide begins to precipitate first 99.955% of the l precipitates before any sohd AgBr is formed. Silver bromide begins to precipitate next 99.82% of the Br" and 99.999917% of the 1 precipitate before any solid AgCl forms. This shows that we can separate these ions very effectively by fractional precipitation. 

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