A standard solution of Mn2+was prepared by dissolving 0.250±0.002 g of Mn in 10.00 mL of concentrated HNO3 (measured with a graduate cylinder). The resulting solution was quantitatively transferred to a 100.00±0.08 mL volumetric flask and diluted to volume with distilled water. A 10.00±0.02-mL aliquot of the solution was pipetted into a 500.00±0.20-mL volumetric flask and diluted to volume with distilled water.(i) Express the concentration of Mn in the 500 mL flask in parts per millions (ppm) and estimate uncertainty by a propagation of uncertainty calculation.(ii) Would the uncertainty in the solution’s concentration be improved by using a pipette to measure the HNO3, instead of a graduated cylinder? Explain.
A standard solution of Mn2+was prepared by dissolving 0.250±0.002 g of Mn in 10.00 mL of concentrated HNO3 (measured with a graduate cylinder). The resulting solution was quantitatively transferred to a 100.00±0.08 mL volumetric flask and diluted to volume with distilled water. A 10.00±0.02-mL aliquot of the solution was pipetted into a 500.00±0.20-mL volumetric flask and diluted to volume with distilled water.(i) Express the concentration of Mn in the 500 mL flask in parts per millions (ppm) and estimate uncertainty by a propagation of uncertainty calculation.(ii) Would the uncertainty in the solution’s concentration be improved by using a pipette to measure the HNO3, instead of a graduated cylinder? Explain.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A standard solution of Mn2+was prepared by dissolving 0.250±0.002 g of Mn in 10.00 mL of concentrated HNO3 (measured with a graduate cylinder). The resulting solution was quantitatively transferred to a 100.00±0.08 mL volumetric flask and diluted to volume with distilled water. A 10.00±0.02-mL aliquot of the solution was pipetted into a 500.00±0.20-mL volumetric flask and diluted to volume with distilled water.
(i) Express the concentration of Mn in the 500 mL flask in parts per millions (ppm) and estimate uncertainty by a propagation of uncertainty calculation.
(ii) Would the uncertainty in the solution’s concentration be improved by using a pipette to measure the HNO3, instead of a graduated cylinder? Explain.
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