Calculate the equilibrium constant at 25 C for the reaction 2 Ag+(aq) + Hg() 2 Ag(s) + Hg2+(aq)

The standard addition method is used to determine the concentration of vitamin C in apple juice by polarography, a method that produces a current that is proportional to concentration. A 2.00 mL sample of apple juice is diluted to a total volume of 25.0 mL, which gives a current reading of 1.01 µA. This solution is then spiked with a 5.00 mL aliquot of a 262 mg/L solution of vitamin C, producing a reading of 2.27 µA. What is the concentration of vitamin C in the apple juice? Concentration of vitamin C (mg/L):

We want to determine the purity of copper in the wires used for electrical cables. This can be done using an electrolysis device with platinum electrodes and the following procedure: Weigh the electrodes and a piece of copper wire from a wire and record their mass. Dissolve the copper metal (Cu) with a solution of relatively dilute HNO3 (aq). Add hydrazine (N2H4) to the solution to give the solution a reducing agent better than H2O. Place the solution in the electrolysis apparatus, immerse the electrodes in it and start transmitting electricity. Copper metal (Cu) begins to deposit on one of the two electrodes. At the same time, we observe that gas bubbles are released from the solution. When the reaction is complete, stop the passage of electricity, disconnect the electrode, to which Cu has been deposited, and after drying, weigh it. From the difference in mass of the electrode and the known amount of Cu that we had dissolved, we calculate the purity of Cu. (a) At which electrode is Cu…