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Standard sample size 
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#1
Sep3007, 08:25 PM

P: 129

Sometimes, when repeated assays are to be performed, the sample size is standardized and chosen such that the ultimately measured quantigy is numerically equivalent to some other desired proportionate quantity.
suppose the sulfur content of a mineral sample is determined by complete conversion to Ag2S(s) what mass of sample must be chosen so that the number of grams of Ag2S obtained is equal to 4 times the percent sulfur in the sample?? i don't know where do start................ 


#2
Sep3007, 10:10 PM

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PF Gold
P: 11,155

Begin here: Let the sample contain x% of sulfur (S) and have a mass m. Then the mass of S in the sample is ...



#3
Sep3007, 10:17 PM

P: 129

how do i find mass if i don't know how much Ag2S i have?



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