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A = 2.0 — log %T
A = log 1/T
A = —logT
A = abc (absorbance, path length, conc.)
Beer’s law
Cu = Au/As x CS
Cu = conc. of unknown
Au = absorbance of uknown
As = absorbance of standard
Cs = conc. of unknown
conc. of unknown: Beer’s law

osmolality using freezing point osmometer
2(Na) + glucose/20 + BUN/3 = mOsm/kg ⭐️
1.86Na + glucose/18 + BUN/2.8 + 9
2 formulas of osmolality
%/100 = x/volume or weight given of required
concentration (% soln.)

Molarity (M)

Normality (N)

dilution
value from diluted specimen x reciprocal of dilution
correcting for a dilution
final volume (Vf) / initial volume (Vi)
dilution factor
C1V1 = C2V2
another formula for dilution