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No idea what he means, but then description of what you are doing is rather cryptic.If you are told "dilute 5N sulfuric acid 1:20" you are doing OK. But is it what you are told to do, or is it your interpretation of what to do?
add 50.0 mL of a reagent prepared by mixing 40 mL of dilute sulfuric acid (1 in 20)
Quote from: jajabor on October 24, 2013, 01:46:29 PMadd 50.0 mL of a reagent prepared by mixing 40 mL of dilute sulfuric acid (1 in 20)You are misreading the procedure. You need an acid that is equivalent to one prepared by mixing stock H2SO4 (98% w/w) with water 1:20. http://www.youtube.com/v/tkUWxXLUmsUFirst step - mixing stock solution (98% w/w) with water 1 in 20 to find target concentration.Second step - finding volumes that have to be mixed if you start with 5 N solution (2.5 M). Your coworker is right about the ballpark (even 10% error shouldn't matter in this case).
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