Concept explainers
(a)
Interpretation:
The source of junction potential in a glass-reference electrode system should be predicted.
Concept introduction:
Glass electrode consists of a glass bulb that contains a solution of hydrochloric acid with fixed concentration. It is a type of ion selective electrode. It measures the pH of the solution.
(b)
Interpretation:
The source of boundary potential in a membrane electrode should be predicted.
Concept introduction:
Membrane electrodes consists a thin glass membrane and are used to measure the pH of the solution.
(c)
Interpretation:
The source of asymmetric potential in a glass-membrane electrode should be predicted.
Concept introduction:
Membrane electrodes consists a thin glass membrane and are used to measure the pH of the solution.
(d)
Interpretation:
The source of the potential of a crystalline membrane electrode that is used to determine the concentration of
Concept introduction:
Membrane electrodes consists a thin glass membrane and are used to measure the pH of the solution. Crystalline membrane are manufactured by the ionic compounds or a homogeneous mixture of ionic compounds.
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Chapter 23 Solutions
PRINCIPLES OF INSTRUMENTAL ANALYSIS
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- What volume of chlorine gas at standard temperature and pressure is evolved when a solution of MgCl2 is electrolyzed using a current of 12.4 A for 1.0 h?arrow_forwardA current of 8.46×104 A is passed through an electrolysis cell containing molten KCl for 10.3 days.(a) How many grams of potassium are produced? g(b) How many liters of chlorine are collected, if the gas is at a temperature of 273 K and a pressure of 1.00 atm?arrow_forwardWrite the Nernst equations for the variation of half-cell potentials with activities of species in the following half-cells: (a) Cr₂O,2-, Cr³+ | Pt; (b) saturated calomel electrode; (c) quinone, hydroquinone | Pt; (d) H* | CH4, CO₂, Pt.arrow_forward
- (a) Explain why the cell emf is independent of the physical size of the cell. (b) What is the significance of the standard hydrogen electrode?arrow_forward11. Given, Cd(s) + 2H*(aq) Cd2*(aq) + H2(g) State the effect on the cell potential, Ecell when the following changes are made: (a) The pressure of hydrogen gas is increased in the cathode compartment. (b) Sodium hydroxide is added into the electrolyte at the cathode. (c) Concentration of Cd2+ is decreased. (d) Diameters of electrodes are increased.arrow_forwardA current of 7.14×104 A is passed through an electrolysis cell containing molten KCl for 13.9 days.(a) How many grams of potassium are produced? g(b) How many liters of chlorine are collected, if the gas is at a temperature of 273 K and a pressure of 1.00 atm? Larrow_forward
- (a) Determine the mass of Na,S2O3.5H20 required to prepare 0.1N solution in 50 ml volume. (b) Compare combustion of Anthracene and Xylene in sufficient supply of air. Which one will produce more carbon rich sooty flame and why? (c) Consider electrode potential data given in Question 4 (c). Predict which two electrodes combination will give maximum potential. Provide justification. (d) Explain two industrial applications of acidic buffer solutions. (e) Discuss the importance of Hess law with suitable example.arrow_forwardWith the values of ΔrG Cd2+(aq) = -77.2 kj mol-1, pH2=1 atm, assemble a galvanic cell and calculate the standard potential.arrow_forwardConsider a battery made from one half-cell that consists of a copper electrode in 1 M CuSO4 solution and another half-cell that consists of a lead electrode in 1 M Pb(NO3)2 solution.(a) What are the reactions at the anode, cathode, and the overall reaction?(b) What is the standard cell potential for the battery?(c) Most devices designed to use dry-cell batteries can operate between 1.0 and 1.5 V. Could this cell be used to make a battery that could replace a dry-cell battery? Why or why not.(d) Suppose sulfuric acid is added to the half-cell with the lead electrode and some PbSO4(s) forms. Would the cell potential increase, decrease, or remain the same?arrow_forward
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