Alkalinity
The total alkalinity of seawater
What is the capacity of basic species to react with H+ to form protonated species?
The type of titration used in the chlorinity lab
What is Fajans titration?
The type of electrode used in the fluoride lab
What is an ion selective electrode? (for extra studying, think about different membranes, sources of interference, draw a diagram, etc.)
The evidence given
Ca2+ in a suspect water sample
The reaction used for the analysis of nitrite
What is the Griess reaction? (for extra studying, write the equations for both steps in the reaction)
The three basic species that contain most of the total alkalinity in seawater
What are the bicarbonate, carbonate, and borate ions? (for extra studying, go through the carbonate series and Bjerrum plot)
The indicator used in the experiment
What is dichlorofluorescein? (for extra studying, read up on how the indicator causes the solution to turn from yellow to pink)
Method used to measure the fluoride content in a contaminated seawater sample
What is standard addition? (for extra studying, review your spreadsheet on how to calculate the concentration of fluoride using standard addition, be familiar with the equation for determining the uncertainty in the x intercept)
The instrument and method used
What is an atomic absorption spectrophotometry (AA) and an external calibration curve? (for extra studying, look up/draw a block diagram of the different components of an AA spectrometer)
The diazotization step of the Griess reaction
NO2– reacts with a primary aryl amine
in acidic conditions to form an aryl diazonium compound
The anode and cathode in the experiment
What is a polished copper electrode (cathode)? What is a carbon electrode (anode)? (for extra studying, draw out the diagram of the electrolytic cell in the experiment)
True or false: the endpoint of the titration coincides with the equivalence point
What is false, the endpoint of the titration does not coincide with the equivalence point? (for extra studying, think about how we calibrated the method)
The equation used to relate measured cell voltage to the fluoride concentration in the sample solution
What is the Nernst equation?
Describe the Beer–Lambert law and give the equation
What is the linear relationship between the absorbance of a solution and its concentration, where A is the absorption, ε in the molar absorption coefficient, b is the path length, and c is the concentration? What is A=εbc?
Genesys 30 is a single OR double beam spectrophotometer (choose one)
What is a single beam spectrophotometer?
Adding more acid to the solution made the solution turn yellow (pH < 7) and flipping the switch made the solution turn ___
What is blue (more basic, pH > 7)?
The error in the mass of the titrant (AgNO3)
What is the drop size of the modified pipette?
The usefulness of standard addition
What is by adding quantified amounts of a
fluoride standard to the sample, and by measuring the voltage response to these additions, you calibrate the
response and compensate for matrix effects? (for extra studying, identify what were potential matrix effects and how those may be resolved)
What is a hollow cathode lamp coated in calcium? (for extra studying, read up on the different parts of an AAS
An external calibration curve was made with ___
What are standard solutions of NaNO2 prepared in distilled water? (for extra studying, look at your spreadsheet to see how you made your calibration curve)
What is the Gran plot? (for extra studying, go through your spreadsheet to look at how you made your Gran plot and what values you used to calculate total alkalinity)
What is conservative? The ratio of the major dissolved salts in the open ocean remains constant, unless water mass is changed. if salinity is known, chlorinity is known (and vice versa).
The fluoride lab had you measure the voltage reading and one other value, which was ___
What is temperature? (for extra studying, note that the Nernst equation has a temperature dependence and look back on how temperature affected your final value)
What is a dilution equation, M1V1=M2V2?
The effect on your results if the NED concentration was accidentally doubled
What is nothing, the reagents are already in excess?