which part of a ph probe is unaffected by temperature or the presenceof hydrogen ions? 1. ISE 2. MEasurement Electrode 3. Porous Junction4. Reference Electrode

The question is asking us to identify the part of a pH probe that remains unaffected by changes in…

Answered: which part of a ph probe is unaffected…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter21: Potentiometry

Section: Chapter Questions

Problem 21.1QAP

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The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00C is given by the equation where contains the potential of the reference electrode and all other potentials that arise in the cell that are not related to the hydrogen ion concentration. Assume that = 0.250 V and that a. What is the uncertainty in the values of pH and [H+] if the uncertainty in the measured potential is 1 m V ( 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be 0.02 pH unit?
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?
For the cell: Cr|Cr3+Co2+|Co E° is 0.46 V. The same cell was prepared in the laboratory at standard conditions. The voltage obtained was 0.40 V. A possible explanation for the difference is (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 Cr(NO3)2 solution used was less than 1.0 M. (d) the concentration of Cr(NO3)2 solution used was less than 1.0 M. (e) the volume of Cr(NO3)2 solution used was larger than the volume of Cr(NO3)2 solution used.
A Zn electrode for Zn2+ analysis is what type of indicator electrode? a. glass electrode b. metallic electrode of the second kind c. metallic electrode of the first kind d. liquid membrane electrode
Solution pH can be measured .29 :using A. Metal/Metal ion electrode B. Metal insoluble oxide electrode C. Metal amalgam electrode D. Metal-insoluble salt electrodes
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 - 12
All of the following can be used as indicator electrodes, except A. Ag/AgCl electrode B. Hg/HgCl electrode C. Cu/CuCl electrode D. Calomel electrode
Which 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.
Briefly explain the theory of Clark and Lyons about the first enzyme-based electrode in detecting glucose
Which of the following is an example of an indicator electrode for bromide measurements in seawater? Group of answer choices Ion selective electrode Standard hydrogen electrode Saturated calomel electrode Silver-silver chloride electrode

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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