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Thread: Question on Silver Chloride (gravimetric analysis)

  1. #1 Question on Silver Chloride (gravimetric analysis) 
    Forum Freshman chicken_boy's Avatar
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    Forgive me for asking such a broad question, but does anybody know by how much (on average) oxygen discoloration will affect the percent chloride obtained from the precipitation of chloride from a sample using an aqueous solution of Silver Nitrate? More specifically, if the experimenter was to do this precipitation twice, the first time getting a white grey precipitate (no observeable purple/oxygen discoloration at all), and the second time the experimenter exposed his sample to light and recieved a purplish precipitate, by how much would the calculated percent Chloride result differ in the 2 samples?

    As an example, say that I precipitated chloride from an unknown sample and obtained a pure white precipitate and calculated out that the original sample contained 56.4% Chloride in it. If the precipitate had been purple, by how much would I expect my result to deviate from 56.4% (or would it not deviate noticeably at all?)? I wish I could try this in the lab for myself, but my school is cheap and I only get to do this once (in case you are wondering, I recieved a white precipitate by obsessesively shielding my sample from the light, while everyone around me had purple precipitates because they didn't shield their samples from the light and I was wondering how much of a difference this would have made on the final result).

    Thanks in advance for any help


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