exam 1 Flashcards
(25 cards)
qualitative analysis
what is the substance?
quantitative analysis
how much is there in the substance?
repeatability
with in a batch
reproducibility
between batches
homogenous
uniform composition, all the same throughout
heterogenous
non-uniform composition, need more samples randomly selected throughout
experimental process and design
formation of question, analytical procedure, sample prep, analysis, reporting, drawing conclusions
weight %
(mass A/ Mass total)*100
Volume %
(Volume A/volume total) *100
% weight/volume
(mass A/Volume total)*100
Parts per…
ppt= 1L/1000mL
ppm= 1g/ 1,000,000microg
analyte
substance being measured
slurry
a suspention of a solid in a solvent
aqueous
a solution of anything in water
supernatant
a liquid remaining above a solid after precipitation
aliquot
a portion of a sample
standard solution
a solution whose composition is known accurately
sample
a portion of material used for analysis
SG- specific gravity
density of solution (g/ml)/density of H2O (g/ml)
Log X=Y
X=10^Y
systematic error
correctable errors (ex. not taring the balance)
Random error
uncontrollable and never completely eliminated
percision
how close a group of points are to each toher
accuracy
how close a group of points are to the true value
