CHEM 14BL QUESTIONS WITH COMPLETE ANSWERS

equivalence point pH


Give this one a try later!


SA w/ SB -> H2O production. ph=7
WA w/ SB -> pH > 7 because WB is produced
WB w/ SA -> pH < 7 because WA is produced
WA w/ WB -> undetermined b/c we don't know the degree of the reaction

,How do we find the slope from Beer's Law plot?


Give this one a try later!


Find the slope.
C = A(unknown) / EL = A(unknown) / slope




Why might the dissolved compound fail to crystallize?


Give this one a try later!


You put too much solvent.




How can we find the absorbance/concentration for solutions of the same chemical
species w/ different concentrations?


Give this one a try later!


Use proportions




ppb


Give this one a try later!


µg/L

, Relationship between abosrbance and transmittance


Give this one a try later!


Absorbance is proportional to transmittance. When absorbance increases,
transmittance decreases.
A= -log T
T = 10^(-A)




equivalence point


Give this one a try later!


point at which moles acid = moles of base (m(acid)v(acid) = m(base)v(base))




titrant


Give this one a try later!


base of known concentration




serial dilution


Give this one a try later!