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Quant. Analysis
Final Exam
21
Chemistry
Undergraduate 4
12/01/2014

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Term
Partition Coefficient
Definition
equilibrium constant for rxn. in which a solute is partitioned between 2 phases
Term
Elution
Definition
process of passing a liquid or gas through a chromatography column
Term
Plate Height
Definition
length of a chromatography column divided by the # of theoretical plates in the column
Term
Fluorescence
Definition
process in which molecule emits a photon after absorbing a photon, which results from transition between states of same spin multiplicity
Term
Frequency
Definition
the # of cycles per unit time for a repetitive event
Term
Absorbance
Definition
the logarithmic fxn. of the radiant power of light striking the sample on one side divided by the radiant power emerging from the other side
Term
Solubility Product (Ksp)
Definition
equilibrium constant for the dissociation of solid salt to give its ions in soln.
Term
Equilibrium Constant (K)
Definition
the value of the rxn. quotient when the rxn. has reached equilibrium
Term
Robustness
Definition
ability of an analytical method to be unaffected by sm., deliberate changes in operating parameters
Term
Lower Limit of Quantitation
Definition
sm.est amt. of analyte that can be measured w/reasonable accuracy
Term
Degrees of Freedom
Definition
# of observations minus the # of parameters estimated from the observations
Term
Calibration Curve
Definition
a graph showing the value of some property vs. concentration of analyte
Term
Accuracy
Definition
a measure of how close a measured value is to the "true" value
Term
Systematic Error
Definition
error due to procedural or instrumental factors that cause a measurement to be consistently too lg. or too sm., and can be corrected
Term
Hygroscopic
Definition
a substance that readily picks up water from the atmosphere
Term
Meniscus
Definition
curved surface of a liquid
Term
Filtrate
Definition
liquid that passes through a filter
Term
Primary Standard
Definition
a reagent that's pure and stable enough to be used directly after weighing
Term
Parts Per Million (ppm)
Definition
an expression of concentration denoting micrograms of solute per gram of soln.
Term
Heterogenous
Definition
not uniform throughout
Term
Masking
Definition
process of adding a chemical substance to a sample to prevent one or more components from interfering in a chemical analysis
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