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# Tag Archives: dimensional analysis

In determining the concentration of HCl by titrating against the primary weak base TRIS, the molarity of HCL is calculated using the following equation where GFW is the gram formula weight of TRIS, which is 121.136 g/mol. (a) Calculate the … Continue reading

Posted in Calculation, Error Analysis, Essay Question
Tagged concentrations, dimensional analysis, propagation of error
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## 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 more than ±2% (that is, an uncertainty of … Continue reading

Posted in Calculation, Error Analysis, Essay Question
Tagged dimensional analysis, propagation of error
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## Concentration of Parathion Solutions

Parathion, C10H16NO5PS, is a toxic organophosphorous pesticide. A recently published method [Sacks, et al. Anal. Chem. 2000, 72, 2055-2058] for parathion reports a detection limit of 10 ng/mL. Express this concentration in ppm and molarity.

## Concentrations

Gratzel et. al. [Anal. Chem. 1999, 71, 2751-2756] describe the use of a diffusional microburet to transfer solutions to very small droplets of solvent. The purpose of their work is to run conventional analyses, such as titrations, on an extremely … Continue reading