Uncertainity in Dispensing a Reagent
Concentrated HCl is 37.2% w/w HCl (±0.5% w/w) and has a density of 1.19 g/mL (±0.01 g/mL). Suppose that you need to dispense 0.0500 mol of HCl with an uncertainty of no […]
Essay Question
Solubility of Milk of Magnesia
Milk of Magnesia, or MOM, is a suspension of Mg(OH)2. One method for determining the amount of Mg(OH)2 in MOM is to precipitate the Mg2+ as MgNH4PO4. Because this precipitate includes a […]
What is the Difference Between Repeatability, Reproducibility, Accuracy, and Precision?
In an editorial published in American Laboratory (November 2000), Ira S. Krull states that in “any science, then, one must present at the very outset evidence of repeatability, reproducibility, accuracy, and precision […]
Selecting an Analytical Method
As part of the study of how humans age, there is an interest in learning how the chemical composition of tissues change as we grow older or as the result of disease. […]