The values for effective diameters and activity coefficients for ions at 25°C are given in the table below. Activity Coefficient at Indicated Ionic Strength Ion ax, nm 0.001 0.005 0.01 0.05 0.1 Ca2+, Cu2+, Zn2+, Sn²+, Mn²+, Fe²+, Ni²+, Co²+, Phthalate² 0.6 0.870 0.748 0.676 0.48 0.40 Pb2+, CO3², SO3², C₂04² 3+ Al3+, Fe 3+, Cr3+, La³+, Ce³+ ' Th, Zr, Ce+, Sn4+ ' Use the Debye-Hückel equation 0.45 0.868 0.741 0.665 0.45 0.36 0.9 0.737 0.540 0.443 0.24 0.18 1.1 0.587 0.348 0.252 0.10 0.063 0.51Z√ -log Yx 1+3.3ax√ to calculate the activity coefficient of

The values for effective diameters and activity coefficients for ions at 25°C are given in the table below. Activity Coefficient at Indicated Ionic Strength Ion ax, nm 0.001 0.005 0.01 0.05 0.1 Ca2+, Cu2+, Zn2+, Sn²+, Mn²+, Fe²+, Ni²+, Co²+, Phthalate² 0.6 0.870 0.748 0.676 0.48 0.40 Pb2+, CO3², SO3², C₂04² 3+ Al3+, Fe 3+, Cr3+, La³+, Ce³+ ' Th, Zr, Ce+, Sn4+ ' Use the Debye-Hückel equation 0.45 0.868 0.741 0.665 0.45 0.36 0.9 0.737 0.540 0.443 0.24 0.18 1.1 0.587 0.348 0.252 0.10 0.063 0.51Z√ -log Yx 1+3.3ax√ to calculate the activity coefficient of

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter11: Dynamic Electrochemistry

Section: Chapter Questions

Problem 10P

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A 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!
The metal cadmium tends to form Cd2+ ions. The followingobservations are made: (i) When a strip of zinc metal is placedin CdCl21aq), cadmium metal is deposited on the strip. (ii)When a strip of cadmium metal is placed in Ni1NO3221aq),nickel metal is deposited on the strip. (a) Write net ionicequations to explain each of the preceding observations.(b) Which elements more closely define the position of cadmiumin the activity series? (c) What experiments wouldyou need to perform to locate more precisely the position ofcadmium in the activity series?
Historically, chromium (Cr) has been used in numerous industrial processes, including leather tanning and metal plating operations. In these applications, if the water is mildly acidic, the Cr is typically present as bichromate (HCrO4) and/or dichromate (Cr2O72-) ions. These ions can be interconverted by the reaction: Cr₂O7²- + H₂O The standard Gibbs energies of formation of HCrO4, Cr2O72, and H₂O are -764.8, -1301, and -237.18 kJ/mol, respectively. Compute the equilibrium constant for the conversion of HCrO4 to Cr₂O7²-. 2HCrO4
Calculate the ionic strength of 0.5M Al2(SO4)3.
5. Calculate the Ionic strength of solution prepared by mixing of 0.2 M NaNO3and 0.02M of K2Cr2O7:a) 0.56 b) 0.44c) 0.72 d) 0.26e) 0.64
The cell SCE // Ag2CrO4 (sat'd), CrO42- (x M) / Ag is used for the determination of pCrO4. Calculate pCrO4 when the cell potential is 0.336 V.
For the cell Zn(s) | Zn2+(2M) | | Cu2+(0.5 M) | Cu(s)(a) Write equation for each half-reaction.(b) Calculate the cell potential at 25 °C.[Given: EZn2+/Zn= – 0.76 V; ECu2+/Cu= + 0 .34V]
Calculate the ionic strength of a solution that is 0.040 mol kg−1 in K3[Fe(CN)6](aq), 0.030 mol kg−1 in KCl(aq), and 0.050 mol kg−1 in NaBr(aq).
Calculate the following cell potential at T 25 degrees Celsius
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.
The cell potential for Ag, AgCl | HCl (0.35M) || NaIO3 (0.70 M), HCl (0.010 M), I2 (0.25 M) | Pt is 1.28 V 0.98 V 1.44 V 0.81 V 1.14 V