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- Why it is necessary to platinize the electrodes of a conductivity cellbefore it is used for conductance measurement?An ion selective electrode is utilised to determine the concentration of Ca2+ in the presence of Mg2+. The selectivity coefficient for the electrode kij is 0.015. If the concentrations of Ca2+ and Mg2+ are 50 and 500 ppm, respectively, calculate the change in potential (in mV) when the temperature of the measurement cell is increased from 20oC to 40oC.What Range of cathode potentials versus the saturated calomel electrode can be used to quantitatively separate Ag+ and Ni2+ by electrolytic deposition? Assume that the sample solution is initially 0.1000M in each ion and the quantitative removal of an ion is realized when only 1 part in 10000 remains undeposited. ESCE = 0.244V E0Red (Ag+) = 0.8V E0Oxid (Ni) = -0.25V
- Given the following: A cell SCE // Ag2CrO4 (saturated), CrO42- (xM) /AG is used for the determination of pCrO4- (ESCE = -0.244 V at 25 C). The half reaction at indicator electrode is: Ag2CrO4(s) + 2e- 2 Ag(s) + CrO42- (E0 = +0.446 V) What is pCrO4, given the cell potential of 0.402? What type of indicator electrode is Ag in this situation?In the analysis at 25 ° C of chloride using an ion selective electrode (ISE), two 100 mL solutions were prepared. These contain 1.0129x10-2 M and 1.01239x10-3 M Cl- and yielded a potential of 20.3 mV and 79.5 mV, respectively. The value of the electrode slope in mV is:Why is it necessary for the glass in the membrane of a pH sensitive electrode to beappreciably hygroscopic ?
- The resistances of a series of aqueous NaCl 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 and the following values were found at 25oC: c/(mol dm−3) 0.00050 0.0010 0.0050 0.010 0.020 0.050 R/W 3314 1669 342.1 174.1 89.08 37.14 Find the molar conductance of NaCl at 25oC at infinite dilution from the graph.A 0.2g sample of toothpaste containing fluoride was treated with 50 cm3 of a suitable buffer solution and diluted to 100 cm3. Using a fluoride ion-selective electrode, a 25.00 cm3 aliquot of this solution gave cell potentials of –155.3 mV before and –176.2 mV after spiking with 0.1 cm3 of a 0.5 mg/cm3 fluoride standard. Calculate the pF– corresponding to each cell potential and the percentage by weight of fluoride in the toothpaste.Use the shorthand notation to describe a cell consisting of a saturated calomel reference electrode and a silver indicator electrode for the measurement of (a) pSCN. (b) pI. (c) pSO3 (d) pPO. Then, generate an equation that relates pAnion to Ecell for each of the cells. (For Ag2SO3 Ksp = 1.5 * 10-14; for Ag3PO4, K,p = 1.3 *10-20 ).
- Give Reason? (i) Why is a high supporting electrolyte concentration used in most electroanalyticalprocedures?(ii) Why is the reference electrode placed near the working electrode in a threeelectrode cell?When the difference in pH across the membrane of a glass electrode at 25C is 4.63 pH units, how much voltage is generated by the pH gradient? Assume that the constant in Equation 15-6 is 1.00.In a electrochemical cell are the molarity of the electrolyte CdCl2=0.10 kg/mole. Calculate the cellpotential at 25 degrees celcius when the activity coefficient for the proces are 0.10 mol/kg, CdCl2-solvent are decided to be 0.228, and the standard cell-potential are 0.624 V. Please answer very soon will give rating surely Show your work
