Maximise the uptime and include a qualitative analysis on energy storage systems; What are the risks for downtime of the separator? Can the emulsion formed lead to an early end of the separation process? What can you do to mitigate this
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Maximise the uptime and include a qualitative analysis on energy storage systems;
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What are the risks for downtime of the separator? Can the emulsion formed lead to an early end of the separation process? What can you do to mitigate this?
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What can you say about energy storage systems such as batteries? Consider redox flow batteries as an alternative to Li ion battery technology.
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- What is the aim of submerging the electrode in a potassium chloride solution? Must this be stored in a distilled or deionized water? What is the aim of measuring the pH meter utilizing reference buffers?why the reference electrode can serve as a probe to measure relativereduction potentials or even detect a change in pH of solutionWhich of the following statements is/are correct for coulometry? I. Coulometric methods count the electrons used in a chemical reaction to measure the analyte. II. Coulometry uses constant current or constant potential conditions. III. An advantage of coulometric methods is low reproducibility and a disadvantage is low sensitivity. IV. Coulometric titrations are constant potential methods. V. Constant potential methods using a three-electrode cell are more selective than constant-current methods. A). I, II and V B). I, II, IV and V C). I, III and IV D.) II, IV and V
- Which of the following statements is/are correct for coulometry? I. Coulometric methods count the electrons used in a chemical reaction to measure the analyte. II. Coulometry uses constant current or constant potential conditions. III. An advantage of coulometric methods is low reproducibility and a disadvantage is low sensitivity. IV. Coulometric titrations are constant potential methods. V. Constant potential methods using a three-electrode cell are more selective than constant-current methods.One method for determining whether an individual has recently fired a gun is to look for traces of antimony in the residue collected from the individual’s hands. Anodic stripping voltammetry at a mercury film electrode is ideally suited for this analysis. In a typical analysis a sample is collected from a suspect with a cotton-tipped swab wetted with 5% v/v HNO3. After returning to thelab, the swab is placed in a vial containing 5.0 mL of 4 M HCl that is 0.02 Min hydrazine sulfate. After allowing the swab to soak overnight, a 4.0-mL portion of the solution is transferred to an electrochemical cell along with 100 mL of 0.01 M HgCl2. After depositing the thin film of mercury and the antimony, the stripping step gives a peak current of 0.38 μA. After adding a standard addition of 100 μL of 5.00×102 ppb Sb, the peak current increases to 1.14 μA. How many nanograms of Sb were collected from the suspect’sOne method for determining whether an individual recently fired a gun is to look for traces of antimony in residue collected from the individual’s hands. Anodic stripping voltammetry at a mercury film electrode is ideally suited for this analysis. In a typical analysis a sample is collected from a suspect using a cotton-tipped swab wetted with 5% v/v HNO3. After returning to the lab, the swab is placed in a vial that contains 5.0 mL of 4 M HCl that is 0.02 M in hydrazine sulfate. After soaking the swab, a 4.0-mL portion of the solution is transferred to an electrochemical cell along with 100 μL of 0.01 M HgCl2. After depositing the thin film of mercury and the antimony, the stripping step gives a peak current of 0.38 μA. After adding a standard addition of 100 μL of 00×102 ppb Sb, the peak current increases to 1.14 μA. How many nanograms of Sb were collected from the suspect’s hand?
- A bare silver wire electrode is dipped into a solution 0.05M in KNO3 (supporting electrolyte) and saturated in AgBr (Ksp = 5.0 x 10-13), and connected to the back of an mV/pH meter along with a saturated calomel reference electrode. Calculate the potential of the silver indicator electrode. Calculate the cell potential.Why is it necessary for the glass in the membrane of a pH sensitive electrode to beappreciably hygroscopic ?Two Copper strips were used to determine the effect of supporting electrolyte used on the change in mass. Three different experiments were conducted for 5mins where 0.5A current is applied throughout the experiment. In the first experiment two copper strips were immersed in 3.080g of Cu (NO3)2 dissolved in 25mL of DI water and tested for 5mins while applying current 0.5A. The weight of one copper strip act as an anode is taken before the reaction and after the reaction to calculate the change in mass due to different applied current. Same process is repeated with 25ml 0.5 M CuSO4 and25ml 0.5 M CuCl2 for 5 mins Using Faraday’s equation (Eq 1), calculate the theoretical mass and Compares the theoretical mass (mg) of copper and the actual mass deposited (obtained from the electrolysis, ∆m) by calculating the %error at different times. Discuss the observed results. Q = I x t = nFN Electrolyte Initial mass of anode (mg) Final mass of anode (mg) Cu (NO3)2 2941 2893…
- A 40.00-mL aliquot of 0.05000 M HNO2 is diluted to 75.00 mL and titrated with 0.0800 M Ce4+ . The pH of the solution is maintained at 1.00 throughout the titration; the formal potential of the cerium system is 1.44 V. Calculate the potential of the indicator electrode with respect to a saturated calomel reference electrode after the addition of 5.00 mL of cerium (IV). (Use a MW value in 4 decimal places)An indicator electrode is an electrode A. whose potential is known, constant and independent of the type of solution in which it is immersed. B. hat responds to the activity of its cation in solution. C. used in potentiometry that responds to variations in the activity of an analyte ion or molecule. D. used to determine the concentration of an anion that forms a precipitate or a stable complex with the cation of the electrode metal.2. a) for a buried iron tank protection system using a sacrificial anode, which metal would you use as the anode? justifyb) make a schematic drawing representing this system and explain how this protection mechanism works based on the standard potential of metals, informing the cathodic and anodic half-reactions and specifying the cathodic and anodic region in the drawing.c) name another 4 (four) different corrosion protection processes and briefly explain their mechanism of action.
