ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS A+ GRADED. BUY Quality Materials!
how do you calculate dilution factor?
(volume of sample + volume of diluent)/(volume of sample)
how do you calculate absorbance with the beer lambert law?
A=ebc where e=molar absorptivity (1/Mcm) b=...
how do you calculate dilution factor?
(volume of sample + volume of diluent)/(volume of sample)
how do you calculate absorbance with the beer lambert law?
A=ebc where e=molar absorptivity (1/Mcm) b= pathlengh (cm) c=concentration (M)
who discovered the Beer Lambert Law?
Pierre Bouguer, Johann Lambert, and August Beer, respectively
Absorbance also equals -log of what?
transmittance
what materials can be used for making a cuvette?
quartz, glass, or plastic
what makes up the monochromator?
the entrance slit, dispersion device, and exit slit
what does the light exiting the monochormator appear as?
a band (rainbow)
grating of a monochromator
a flat surface with parallel, regularly spaced grooves in it that reflects the light at
different wavelengths
what kind of detector is used in UV-vis spectrometers?
phototube
photomultiplier tube
produces a cascade effect on the electron emmision production
the PMT possesses high _______, good ______ ratio, and excllent dynamic _____
sensitivity, S/N, range
what kind of detector would you use in UV-vis for a very low concentration of
analyte?
PMT
what can damage PMTs?
intense light sources such as daylight or stray light
luminescence
energy is absorbed by a molecule or atom and then emitted at a different wavelength
fluorescence
the light that is emitted at a new wavelength (longer)
atomic absorption spectroscopy
based on the fact that ground state atoms absorb light at specific wavelengths.
Wavelengths at which EMR is absorbed is specific for a particular element.
what elements can not be detected by AAS?
noble gases, halogens, C, H, N, O, P
nebulizer is what?
a device in AAS and ICP-AES that converts the sample solution into a fine mist
ICP-AES
inductively coupled argon plasma atomicemission spectrophotometry
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