A 1.5000g sample of a mixture of lithium chloride and lithium bromide was dissolved in water and treated with a 0.1 M AgNO3 solution. The resulting precipitate was filtered, washed, dried and weighed. It weighed 4.463g. A second 1.5000g sample of the mixture was treated with excess chlorine gas, dissolved in water, and treated with 0.1 M AgNO3 solution. The resulting precipitate was filtered, washed, dried, and weighed. Its weight was 4.207g. Determine the weight percentages of lithium chloride and lithium bromiede in the mixture.
GFW LiBr-86.845 g/mol
GFW AgNO3-169.8731 g/mol
GFW LiCl-42.39 g/mol
The Attempt at a Solution
I'm completely confused. First of all, the AgNO3 will react to for AgCl, but won't it also react to create AgBr? Also, what is the point of treating the solution with excess chlorine gas? The extra chlorine didn't increase the amount of ppt. so that kinda confuses me. HELP!!! I have a quant. exam on wednsday and this is most likely gonna be on there in some form or another. Any help is appreciated!!