QC Flashcards
Establishes the realtive amt of a chemical sp in a sx
Quantitative ana
Reveals the chemical identity of the species in a sx
Qualitative ana
Amt of all the constituents is determined
Complete/ultimate
One or more, but not all the constituents are determined
Partial
Sx is more than 0.1g
Microanalysis
Sx is more than 10-100mg
Semi micro ana
Sx is 1-100mg
Microanalysis
Sx is <1mg
Ultramicro analysis
Analyte present is in high concentration
Macro or major
Ana is in low conc
Trace analysis
Involves the measurement of the volume of soln that will react with the analyte
Volumetric
Titrimetric
Measurement of the weight of a sx of known identity
Gravimetric
Based on the measurement of the physical and chemical props
Physicochemical
Instrumentation
Portions of a material of approximately same size carried thru same analytical procedure
Replicate sx
Species that causes an error by enhancing/attenuating the qty being measured
Interference
Middle value in a data arranged in order of size
Median
Indicates closeness of the measurement to its true or accepted value
Accuracy
Reproducibility of measurements or closeness of results
Precision
All steps in an analysis done in the absence of the sx
Corrects error due to contaminants
Blank det
Data is scattered asymmetrically around a mean value
Reflected by precision in the measurement
Random/indeterminate
Differs from the accepted value, either all high or all low
Affects accuracy of the results
Systematic/determinate
Non aqueous acidimetry, neutral solvent
Acetonitrile
Alcohols
Chloroform
Benzene
Non aqueous acidimetry, acidic solvent
Formic acid
GAA
Acetic anhydride
Non aqueous acidimetry indicator
Crystal violet
Malachite green
Used in the ana of cmpds of AG, Hg, halides and theophylline
Precipitation method
Colored secondary ppt
K2CrO4 - indicator
AgNO3- titrant
Mohr
Colored adsorption product
Flourescein, DCF, TEE, eosin y
Fajans
Colored complex ion
Ferric alum indicator
Volhards
Renders the metals in a soln inactive
Masking agents
Suppress Al edta in presence of Mg edta
Triethanolamine
(X) Hg, Cu
(Y) zn at ph 6
Thioglycols
Direct edta titrations
Divalent ions
Indicators for edta titration
Hydroxynaphthol blue
Eriochrome black
Dithizone
Deep blue color at endpoint
Hydroxynaphthol blue
Eriochrome black
Rose pink color at endpoint
Dithizone
True redox indicators
Orthophenanthroline
Diphenylamine
Starch
Malic acid
Hydrogen peroxide
Na nitrile
Permanganate method
Ferrous uslfate assay
Vitamin k menadione
Ceric sulfate
Titration with bromine
Phenol
Aniline
Cresol