of an known Concentration of Iron Section Date ORT Partner(s) DATA Concentration
ID: 521710 • Letter: O
Question
of an known Concentration of Iron Section Date ORT Partner(s) DATA Concentration of (undiluted) standard iron solution. 0,0 So D39 mg Fe/mL Concentration of diluted iron standard solutions: men vv m I VI L Standard Final Volume nal Concentration 0.00 25 mL 0.000 mg Fe/mL olution 2.00 25.00 4.00 25.00 6.00 25.00 8.00 25.00 "Show a sample calculation for at least one final concentration: Absorbance Measurements: Solution Absorbance 00.0 0.000 0.270 Unknown *Show sample calculation of Absorbance from T: Unknown Sample Mass of Unknown Sample containing Fe 0165 Page 1Explanation / Answer
Formula
M1V1= M2V2
then
M2= M1V1/V2
Hence
1) M2= 0.050039 mg Fe/mL x 2 mL/ 25 mL
= 0.00400312 mg Fe/mL
2)
M2= 0.050039 mg Fe/mL x 4 mL/ 25 mL
= 0.00800624 mg Fe/mL
3)
M2= 0.050039 mg Fe/mL x 6 mL/ 25 mL
= 0.01200936 mg Fe/mL
4)
M2= 0.050039 mg Fe/mL x 2 mL/ 25 mL
= 0.01601248 mg Fe/mL
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