(a)
Interpretation:
The equation for
Concept introduction:
The equation for
Here,
(b)
Interpretation:
The total charge needed to strip the silver from the electrode needs to be determined. Also, the volume of the solution used to deposit the silver needs to be determined,
Concept introduction:
The equation for
Here,
(c)
Interpretation:
The experiments need to be suggested to show whether all the
Concept introduction:
Linear scale voltammetry is used to compare the data for the metal reduction in the deposition step.
(d)
Interpretation:
Whether it matters when the shape of the drop is hemisphere or not needs to be explained.
Concept introduction:
Visual measurement of droplet which is spherical or hemispherical in shape.
(e)
Interpretation:
The alternative method for testing against the proposed method needs to be suggested.
Concept introduction:
Volume of the sphere or volume of the hemisphere can be calculated as follows-
Where
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Principles of Instrumental Analysis
- 3) Name the errors of glass electrodes in potentiometric measurements (please write correctly and concisely).arrow_forwardIn a certain conductivity cell, the resistance of a 0.01 M KCl solution is 150 W. The known molar conductivity of the solution is 141.27 W-1 cm2 mol-1. Calculate the cell constant (Kcell). *(Kcell unit is cm-1)arrow_forward1) Name the applications of glass electrodes in potentiometric measurements (please write correctly and concisely).arrow_forward
- The resistances of a series of aqueous NaCI solutions, formed by successive dilution of a sample, were measured in a cell with cell constant (the constant C in the relation κ = C/R) equal to 0.2063 cm-1. The following values were found: c/(mol dm-3) 0.00050 0.0010 0.0050 0.010 0.020 0.050R/Ω 3314 1669 342.1 172.5 89.08 3714(a) Verify that the molar conductivity follows the Kohlrausch law and find the limiting molar conductivity. (b) Determine the coefficient κ, (c) Use the value of κ (which should depend only on the nature, not the identity of the ions) and the information that λ(Na+) = 5.01 mS m2 mol-1 and , λ(I-) = 768 mS m2 mol-1, to predict (i) the molar conductivity, (ii) the conductivity,(iii) the resistance it would show in the cell, of 0.010 mol dm-3 Nal(aq) at 25 °C.arrow_forward6) Voltammetry - In linear scan voltammetry, the diffusion current is proportional to the concentration of the species being reduced. In one experiment 250.00 mL of a 6.00 x 104 M Cd2+ (aq) solution was analyzed using a mercury electrode. The voltammetry scan from -0.6 to -1.2 V took 3.40 minutes to complete. The diffusion current for the reduction of Cd2+ at the mercury electrode was 14.0 μA (14.0 x 106 A). Cd²+ (aq) + 2 e --- -> Cd (s) a) How many mmol Cd2+ were initially present? (in the 250.00 mL solution) b) Using the current and time, calculate the charge (coulombs) delivered to the solution. c) How many mmol of Cd²+ were reduced (deposited) during the analysis by this current? d) Using the answers from parts (a) and (c), calculate the percentage of Cd²+ that was reduced in the analysis. e) A second solution of unknown Cd2+ concentration was analyzed similarly and the diffusion current was only 10.2 µA. What is the Cd2+ for the unknown solution? (Use current is proportional to…arrow_forwardBy employing a given conductivity cell with 0.1N potassium chloride at 18pC, an observed conductance of 0.025 mho was obtained. What is the cell constant if the specific conductance of KCL at 18°C is 0.0112 mho.arrow_forward
- The resistance of a decinormal solution of a salt occupying a volume between Pt electrodes is 1.80 cm apart and 5.4 cm2 in area was found to be 32 ohms. Calculate the equivalent conductance of the solution.arrow_forwardSolutions of three electrolytes have the same ionic strength and different dielectric constants as 4, 25 and 81 and expected temperature is 225 K, 256 K and 298 K. The corresponding relative magnitude of Debye-Huckel screening lengths of the three solutions are: (a) 60, 400 and 1377(b) 30, 80 and 155(c) 15/2, 16/5, and 17/9arrow_forwardThe following data were measured in a 1.00-cm cell. Concentration (M) %T 1.50x10-4 14.9 1.00×10-4 26.1 7.50x10-5 38.0 5.00x10-5 54.3 3.00x10-5 65.7 Determine the molar absorptivity( in cm ¹M-¹) using graphical methods.arrow_forward
- The limiting conductance of potassium metaiodomandelate was calculated to be 100.32 cm² 2-¹ mol-¹ from measurements at 25°C. A resistance cell with the cell constant 0.4353 cm-¹ was filled with 1.1576 mM metaiodomandelic acid; the resistance at 25°C was measured as 2013.8 2. The limiting conductances for hydrochloric acid and potassium chloride at 25°C are assumed to be 426.36 and 149.93 cm² -1 mol-¹. Find the K₂ of metaiodomandelic acid at 25°C. Express your answer in three significant figures.arrow_forwardA conductivity cell filled with a 0.01 M KCl solution was found to have a resistance of 189 ohms at 25oC. When filled with 0.01 M HCl solution, the cell gave a resistance of 64.8 ohms at the same temperature. At 25oC, the conductivity of 0.01 M KCl solution was 1.4088 x 10-3 S cm-1. Calculate (a) the cell constant and (b) the conductivity of the HCl solution. answer is [0.266; 4.105 x 10-3] please explain. thank you!arrow_forwardThe resistance of a conductivity cell containing a 0.02 M aqueous solution of KCl was fond to be 83 ohms at 298 K. The conductivity of the 0.02 M KCl solution at this temperature is 0.00277 S cm-1. When the cell was filled with a 0.005 M aqueous solution of K2SO4, it exhibited a resistance of 326 ohms at the same temperature. What is the molar conductivity of the potassium sulfate solution? [ answer should be 141 S cm2 mol-1]thank uarrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning