Chem Lab Terms
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Chelate | show 🗑
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| complexometric titration | show 🗑
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| show | a way to determine the contents of a substance quantitatively.
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| show | Here the analyte is treated with an excess of a second metal bound to EDTA. The analyte ion displaces the second metal from the EDTA complex
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| Lewis acid | show 🗑
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| show | electron pair donors
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| Ligand | show 🗑
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| monodentate ligand | show 🗑
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| show | binds to the metal ligand through more than one ligand atom
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| show | portion that represents a whole
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| aliquot factor | show 🗑
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| show | substance that is undergoing analysis (substance being measured)
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| show | concentration when you weigh something and dissolve it→ the total number of moles in
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| show | the actual concentration
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| density | show 🗑
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| molarity | show 🗑
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| show | molar mass ( mass of a molecule) calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula
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| show | weight solute/ mL sample
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| show | identifying what is in an unknown
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| quantitative analysis | show 🗑
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| show | mass of product is measured to determine how much unknown was present
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| analytical balance | show 🗑
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| show | used to titrate→ goes to 4 s.f. measures in mL
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| desiccant | show 🗑
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| desiccator | show 🗑
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| direct weighing | show 🗑
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| hygroscopic | show 🗑
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| indirect weighing | show 🗑
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| meniscus | show 🗑
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| show | used to transfer known amount of liquid- can go to 4 s.f.
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| tare | show 🗑
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| show | measures to 2 decimal places
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| show | calibrated to contain certain vol of liquid at 20 degrees celcius when bottom of meniscus in in the right spot
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| show | error that occurs when your eye is not at the same height as the meniscus
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| show | difference between delivered and desired volume
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| show | repeatable if measurement made same way (correctable)
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| show | (random error)- from experiment
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| show | reproducibility of replicate deliveries
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| show | where n is number of data points
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| show | range of values in which there is a specified probability of finding the true mean
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| show | characterized by a mean and standard deviation—mean is center of distribution and standard deviation is width→ (bell shaped curve)
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| student’s t test | show 🗑
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| show | most useful quantitity for chemical analysis (A)—higher the absorbance
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| absorbance spectrum → | show 🗑
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| show | absorbance at one wavelength is plotted against different concentrations in a series of standards
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| cuvet→ | show 🗑
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| show | symbolized by epsilon
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| spectrophotometry→ | show 🗑
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| show | the fraction of incident light that passes through a sample T=(P/Po)
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| wavelength→→ | show 🗑
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| Aliquot | show 🗑
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| show | portion of total solution
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| analyte | show 🗑
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| analytical concentration | show 🗑
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| show | the actual concentration
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| show | m/v
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| molarity | show 🗑
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| show | molar mass ( mass of a molecule) calculated as the sum of the mass of each constituent atom multiplied by the number of atoms of that element in the molecular formula
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| show | weight solute/ mL sample
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| qualitative analysis | show 🗑
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| show | identifying how much is present
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| gravimetric analysis | show 🗑
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| show | measure to 4 decimal places
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| buret | show 🗑
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| show | drying agent in dessicator
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| desiccator | show 🗑
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| show | place directly on balance
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| show | absorbs/ attracts moisture from air
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| show | weigh by difference—do not weigh onto balance
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| show | curvature of liquid caused by surface tension
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| pipet | show 🗑
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| tare | show 🗑
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| top-loading balance | show 🗑
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| show | calibrated to contain certain vol of liquid at 20 degrees celcius when bottom of meniscus in in the right spot
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| show | error that occurs when your eye is not at the same height as the meniscus
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| show | difference between delivered and desired volume
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| show | repeatable if measurement made same way (correctable)
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| indeterminate error | show 🗑
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| precision | show 🗑
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| show | (Absolute uncertainty/magnitude of measurement)
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| relative precision (rsd) | show 🗑
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| systematic error | show 🗑
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| show | (n-1)
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| confidence interval | show 🗑
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| show | characterized by a mean and standard deviation—mean is center of distribution and standard deviation is width (bell shaped curve)
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| standard devation | show 🗑
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| show | std deviation devided by mean
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| pooled standard deviation | show 🗑
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| Grubbs test | show 🗑
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| t statistic | show 🗑
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| show | tells you if you can reject or accept your null hypothesis
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| show | to test if variances from two things are equal
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| student’s t test | show 🗑
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| variance | show 🗑
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| show | excess of a standard reagent is added to analyte
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| blank titration | show 🗑
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| show | sudden change in physical property of solution
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| show | when the moles of titrant moles of analyte in their stoichiometric relationship
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| indicator | show 🗑
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| show | pure enough to weigh and use directly for number of moles
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| show | solution containing known quantity of analyte
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| show | titrating to determine concentration of titrant
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| show | known reagent solution
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| titration | show 🗑
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| show | difference between endpoint and equivalence point
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| show | volume of known reagent required for complete reaction with analyte by a known reaction is measured
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| indicator error | show 🗑
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| primary standard acids and bases | show 🗑
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| show | bases
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| Na2CO3 and THAM | show 🗑
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| show | one of the most widely used methods for determining
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| show | the solid is digested in boiling sulfuric acid to convert nitrogen into ammonium
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| Chelate | show 🗑
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| complexometric titration | show 🗑
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| direct titration | show 🗑
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| show | analyte is treated with excess of a second metal bound to EDTA. The analyte ion displaces the second metal from the EDTA complex
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| indirect titration | show 🗑
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| formation constant | show 🗑
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| show | electron pair acceptor
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| show | electron pair donors
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| show | atom or group of atoms bound to whatever atom you are interested in
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| show | prevents impurities from reacting with the precipitant
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| show | ligand that bonds to a metal through only one atom
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| multidentate ligand | show 🗑
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| show | used in Fajans titration
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| argentometric titration | show 🗑
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| Fajans titration | show 🗑
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| show | determination of a chloride by precipitation titration with silver nitrate
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| Vollhard titration | show 🗑
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| show | when a reducing analyte is titrated wIth iodine
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| show | titration Of iodine produced when oxidizing analyte is added to excess I-
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| Spectroscopy Absorbance | show 🗑
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| show | graph showing how A (or epsilon) varies with wavelength
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| show | dependence on concentration and path length
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| show | absorbance at one wavelength is plotted against different concentrations in a series of standards
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| cuvet | show 🗑
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| show | symbolized by epsilon
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| show | the use of electromagnetic radiation to measure chemical concentrations
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| transmittance | show 🗑
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| show | crest- to- crest distance between waves
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