How to calculate the uncertainty of the value using the
uncertainties for 10 ml bulb pipette and the 100 ml standard
flask?
How To Calculate The Uncertainty Of The Value Using The Uncertainties For 10 Ml Bulb Pipette And The 100 Ml Standard Fla 1 (495.74 KiB) Viewed 5 times
How To Calculate The Uncertainty Of The Value Using The Uncertainties For 10 Ml Bulb Pipette And The 100 Ml Standard Fla 2 (506.01 KiB) Viewed 5 times
OT From the equation of the line of best fit: Equation of line of best fit:..... X-0.0.387 x Substitute the absorbances of the unknown solutions into the line equation above and calculate the corresponding manganese concentrations for the diluted solution Unknown (Dihted) Solution Replicate #1 Cx. (mg/L.) Replicate 2 5.633 Replicate 3 5:673 15.633 5.6.33 Mean Css from the table above- ....... (mg/L) Question: Does this value agrees with that obtained from your graph? Calculation of mean deviation (Refer to page 10) (If this is zero mean deviation, then calculate the uncertainty of the value using the uncertainties for the 10 ml bulb pipette and the 100 mL standard flask, as per page 12): Mean deviation of C. values from the table above (mg/L) (1 significant figure only) Using the dilution factor, give the final concentration of the unknown solution: Final Result: C. in the unknown (undiluted stock) solution (mg/L) Conclusion
From the calibration curve: Absorbance Measurements at .. ( 5.nm) Solution C. (mg/L) Absorbance 1 D o 2 2 0.079 3 Y 0.157 4 6 .. 23 5 0.311 6 lo 0.385 Analysis of Unknown #A Replicate # 1 Replicate # 2 Replicate #3 Average absorbance of replicates: 0.21f 0.218 0.21+ 0.218 Plot the calibration curve of the Absorbance (solutions 1 - 6) vs. C. (mg/L). Average concentration of diluted unknown from the graph - 0.818 mg/L Comment on the linearity of the calibration curve: Why is it important to use the same cuvette for all measurements?
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