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QUESTION 1
An electrochemical cell is constructed by placing a Ag|AgCl reference electrode and a silver wire in contact with a solution containing an unknown concentration of silver ions, Ag+.
(a) What kind of electrode is the Ag|AgCl reference electrode - first, second or third - and why?
(b) The above electrochemical cell has a measured potential of +0.470 V. Calculate pAg+ and the silver ion activity aAg+ of the solution.
(c) The standard electrode potential for the Fe3+/Fe2+ half cell is +0.771V. In reality a Pt electrode immersed in a solution that is both 1M in Fe3+ and Fe2+ will have a slightly lower potential than this. Explain briefly why this is so.
The following data were recorded in the analysis of erythropoietin in a plasma sample, as mg/dL. Which of the results, if any, could be statistically rejected with 95% confidence?
What is the pH of the solution at the cathode if E^o cell = -0.362V for the following electrochemical cell at 25 degrees C? Pt | Hw(g,1.0 atm) | H+(aq, 1.00M) || H+(aq) | H2(g,1.0atm) | Pt
When ultraviolet radiation of wavelength 58.4nm from a helium lamp is directed on to a sample of krypton, electrons are ejected with a speed of 1.59E6 m/s. Calculate the ionization energy of krypton.
Calculate the total heat required (in joules) to convert 3.95 grams liquid ethanol (C2H5OH) at 25.0 °C to gas at 95.0 °C, given that the boiling point of ethanol is 78.5 °C, heat of vaporization is 40.5 kJ/mol, the specific heat of liquid ethanol is ..
Tooth enamel in mainly hydroxyapatite, Ca10(PO4)6(OH)2. If 1.117g of tooth enamel reacts with acid to give 1.111g of calcium chloride, what is the percentage of hydroxyapatite in the tooth enamel sample
Calculate the vapor pressure of a solution made by dissolving 21.80 g of glucose (molar mass = 180.155 g/mol) in 460.0 g of H2O at 30.0 °C. (The vapor pressure of the pure solvent is 31.82 mmHg at 30.0 °C.)
combustion of 6.51 mg of a compound gave 20.47 mg of co2 and 8.36 mg of h2o. the compound has a molecular weight of
Assemble the alcohols (have the formula of C4H10) in the order of increasing reactivity with concentrated HCl.
What Celsius temperature does oxygen measure .25 L if thepressureis kept constant
How does ease of oxidation correlate with activity? Do highly active metals tend to donate electrons or accept electrons from other metals?
the equivalence point i know you need to use [A-]= moles of HA/(vol water added+vol NaOH added) and believe moles of HA=5.39x10^-3
assume you dissolve 2.56g of malic acid c4h605 in half a liter of water 500g. calculate the molarity molality mole
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