which part of a ph probe is unaffected by temperature or the presence of hydrogen ions? 1. ISE 2. MEasurement Electrode 3. Porous Junction 4. Reference Electrode
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- Galvanic cells harness spontaneous oxidationreduction reactions to produce work by producing a current. They do so by controlling the flow of electrons from the species oxidized to the species reduced. How is a galvanic cell designed? What is in the cathode compartment? The anode compartment? What purpose do electrodes serve? Which way do electrons always flow in the wire connecting the two electrodes in a galvanic cell? Why is it necessary to use a salt bridge or a porous disk in a galvanic cell? Which way do cations flow in the salt bridge? Which way do the anions flow? What is a cell potential and what is a volt?An aqueous solution of an unknown salt of vanadium is electrolyzed by a current of 2.50 amps for 1.90 hours. The electroplating is carried out with an efficiency of 95.0%, resulting in a deposit of 2.850 g of vanadium. a How many faradays are required to deposit the vanadium? b What is the charge on the vanadium ions (based on your calculations)?The cell potential of the following cell at 25C is 0.480 V. ZnZn2+(1M)H+(testsolution)H2(1atm)Pt What is the pH of the test solution?
- 21. (What exactly is meant by potentiometric methods? What are they even?)5. A solution of 0.100 M HCI and a solution of 0.100 M NAOH 14 are prepared. A 40.0 mL sample of one of the solutions is added to a beaker and then titrated with the other solution. A 12 pH electrode is used to obtain the data that are plotted in the 10 titration curve shown. 8. pH a. Identify the solution that was initially added to the beaker and which solution was in the buret. Explain your reasoning. 6. 2 b. At the equivalence point, how many moles of titrant 0- have been added? 20.0 40.0 60.0 80.0 Volume of Titrant Added (mL) c. The same titration is to be performed again, this time using an indicator. Use the information in the table below to select the best indicator for the titration. Explain your choice. pH Range of Color Change Indicator Methyl violet 0-1.6 Methyl red 4-6 Alizarin yellow 10 - 12Which of the following is true about pH probe? a. A pH probe consists of a metallic indicator. b. A pH probe will always have an SCE reference electrode. c. A pH probe is specific for measuring proton concentrations. d. A pH probe is an ion selective electrode that consists of a concentration cell.
- How does hydronium ion concentation relate to electrode potential in potentiometry? a. As temperature increases, the pH also increases. b. Each pH unit represents a 59.1 mV change in potential. c. The increase in pH is linear relationship to the electrode potential. d. Decreased H+ concentration is directly proportional to electrode potential. e. none of theseWhich statement is NOT correct? pH meter should always be standardized before using to make sure that your readings are accurate and repeatable. The electrode tips should never touch the bottom or sides of a beaker. When finished using the pH meter, rinse the electrode and place it in the pH 7 buffer solution on standby. One buffer solution is enough to standardize a pH meter before using.Glass membrane electrodes can be used to measure H + ions in solution. But at a very small concentration of H + ions (alkaline conditions) it gives an error because it also responds to Na + ions. a) Explain the working principle of a glass membrane electrode which can be used to measure H + or pH ions! Include the cell notation on the pH meter's electrode and the equation relating the potential to the H + ions in the solution! b) Calculate the relative error of the H + ion measurement that occurs if the pH meter electrode is used to measure 1 x 10-2 M NaOH solution (assuming kH, Na = 10 ^ -10 and the activity coefficient = 1)
- What happens to the cell potential when the concentration of the catholyte is decreased?Which of the following statements is incorrect? O In metallic indicator electrodes, the potential arises from the tendency of a redox reaction to occur at an electrode surface. O An electrolytic cell is a cell in which an external supply of electrical energy is used to bring about a physical or chemical change. O All statements are correct. O In membrane indicator electrodes, the potential is a kind of junction potential that develops across a membrane that separates the analyte solution from a reference solution. O A galvanic cell is a device which converts the Gibbs free energy of a physical or chemical change into electrical energy.1. For the cell Cr | Cr* || Co2* | Co E° is 0.46V. The same cell was prepared in the laboratory at standard conditions. The voltage obtained was 0.40W, a possible explanation for the difference is STF a. The surface area of the chromium electrode was smaller than the cobalt electrode b. The mass of the chromium electrode was larger than the mass of the cobalt electrode c. The concentration of Co(NO3)2 solution used was less than 1.0M d. The concentration of Cr(NO3)2 solution used was less than 1.0M e. The volume of Co(NO3)2 Solution used was larger than the volume of Cr(NO3)2 solution used.
