Unit #1
[Mass solute/mass total mixture(or solution)] x 100
What is weight percent?
Metal Ions with a charge of => 2 are _____.
What is acidic?
The mass of material deposited at an electrode is measured at constant potential/current.
What is electrogravimetry?
If Fcalc>Ftable then the difference between the precision of the 2 methods is significantly different and therefore you should use...
What is tfailed?
log(5.403 x 10-8)
What is -7.2674?
Error arises from a flaw in equipment or experimental design. It often lacks accuracy but not precision. Consistent, Reproducible, Accountable.
What is systematic/determinate error?
T/F: The name of the compound abbreviated as EDTA is ethylene diamine tetra acetic acid.
What is true?
Constant current can be run until the end of rxn and the time that it takes to complete the rxn determines the amount of analyte present.
What is coulometry?
Tru/False: To determine if the AA content of a vitamin tablet sample determined by two methods agree, the three tests that must always be performed are: t-test, Grubbs test, and f-test.
What is true?
In order to determine the chromium content in a sample of ore, the sample (after proper sample preparation) is titrated with a purple potassium permanganate (KMnO4) solution to form Mn+2 which is clear.
5Cr+2(aq) + MnO4-(aq) + 8H+(aq) <-> 5Cr+3(aq) + Mn+2(aq) + 4H2O (l)
A 0.5240 g ore sample contains an unknown amount of chromium oxide, CrO. 15.24 mL of standardized 0.0278 M KMnO4 is used to titrate the Cr+2 completely. Calculate the % CrO in the ore sample. (MW CrO = 68.00 g/mol)
What is 27.5% CrO?
Expresses the margin of uncertainty associated with a specific measurement.
What is absolute uncertainty?
List the two ways used in graphical analysis of titration data measured by a pH probe, which end point is difficult to determine.
What is First derivative and second derivative?
Name the light sources for the following atomic spectroscopy: Atomic Emission, Atomic absorption, and Atomic Fluorescence.
What is atom in flame, hollow-cathode lamp, and laser?
Use: knowing the ratio of acid and base conjugate pair and Ka we can determine pH.
What is Henderson-Hasselbalch Equation?
The fluorescence of europium in a sample of ground water was measured as 13.2. A second solution combined 2.00 mL of ground water with 4.00 mL of a 3.24 ppb europium standard and was diluted to a total volume of 10.0 mL. The europium fluorescence from the second solution was 15.7. Determine the concentration (ppb) of europium in the sample of ground water.
What is 1.31 ppb?
We can never find the true population mean or population standard deviation because we can only collect a finite number of measurements. ______ gives a range in which there is a specific probability of finding the population mean.
What is confidence intervals?
T/F: The Ksp equilibrium constant represents a chemical reaction written a specific direction and has a corresponding equation. The Ksp equilibrium reaction for CaF2 (s) is 2 Ca+2 (aq) + F-(aq) <-> CaF2 (s) and the correct mathematical equation is Ksp = [CaF2]/[Ca+2][F-]2
What is false?
Solute dissolved in liquid coating.
What is partition chromatography?
Assume PbI2 solubility is low enough not to affect ionic strength, what is the concentration of Pb+2 and I- in 0.1 M NaCl? (Ksp,Pb2=7.9 x 10-9)
What is 4.22 x 10-3?
Consider the titration of 20.0 mL of 0.0500 M KF with 0.0250 Ca(NO3)2 resulting in the formation of the calcium fluoride precipitate, CaF2 (s). Calculate and identify the equivalence point volume.
What is 20.0 mL Ca+2?
Ability to respond reliability and measurably to changes in analyte concentration.
What is sensitivity?
The presence of the weak acid and the addition of the strong base creates a ____ solution up until the pt. in which we reach the ______ _______ and the weak acid is overcome by the strong base.
What is buffer and buffer capacity?
Most commonly microporous silica particle are used and often with octadecyl (C18) bound stationary phase.
What is HPLC?
Convert a beam of ions into an electrical signal.
What is a mass detector?
Calculate the standard potential for the half-rxn
Pd(OH)2(s) + 2e- <->Pd (s) + 2OH-
Given that the Ksp for Pd(OH)2(s) is 3x10-28 and given that the standard potential for the reaction Pd + 2e- <->Pd (s) is 0,915 V.
What is 0.101 V?