stoichiometry Flashcards
gravimetric analysis method
quantative analysis technique.
concentration can be determined by precipartation of one component
1. add voume of the analyte
2. add the excess regaent to precipitate the active ions out
3.weigh the filter paper
3. filter out precipitate and discard filtrate
4. rinse residue with distilled water and dry to constant mass
5. weigh precipitate on the filter paper
precision
when repeat measurement of the same quantity give values close to the ones before
accurate
average set of means are close to the true values
repeatability
experinmental several times with consistent values
reproducability
results are reproduced if investigated by someone else or in another setting
valadility
evidence supports argument
analyte
ion or solution analysed
precipitate
solid formed in a reaction between 2 dissolved substances or gasses
residue
solid remaining in filter paper during filtration
filtrate
liquid that passes through filter paper
dry to constant mass
solid is weighed then dried until the mass is no longer changing
solubility rules
NO3/ group 1 metals/ NH4- soluble
CO3/O/S/PO4- insoluble
Halides- soluble except Ag ,Pb
sulfates except- Ag, Pb, Ba
faults in Gravimetric
incpmplate precipatation- bellow mass
x dryed properly= increase mass
boyles gas law
decrease amount of volume means preasure increase
pv=k which is constant
chalres gas law
for any given amount of gas at a constant preasure of volume is directly proportional to the amount of temperature
V=KT
