Part II: Determination of copper in n unknown sample Mean value of (% of copper in the unknown sample) = Standard Deviation Relative Standard Deviation = ง C Part II: Determination of copper in n unknown sample Run 1 Run 2 Run 3 Mass of unknown sample (g) 0.1850g 0.1935g 0.1783g Initial Buret reading (mL) 0.05ml 0.00ml 0.05ml Final Buret reading (mL) 18.56ml 19.25ml 17.35ml Total volume of Na2S2O3 added (mL) # of mole of Na2S2O3 added # of mole of copper in the unknown sample Mass of copper in the unknown sample (g) % of copper in the unknown sample Mean value of (% of copper in the unknown sample) = Standard Deviation = Relative Standard Deviation =

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