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- The table shows a series of standard additions of Cu(II)to acidified water samples measured by anodic stripping voltammetry at a platinum electrode. The unknown and all standard additions were made up to the same final volume. 1. What chemical reaction occurs during the concentration stage of the analysis?2. What chemical reaction occurs during the stripping stage of the analysis?3. Plot absorbance as a function of the concentration of Cu (II) standard. Determine the equation of theline and the X intercept. Find the concentration of Cu(II) in the water.10 m2 with 7-micron silver coating only in certain areas on I total 50 m2 surface field copper materials were scrapped. The recovery of silver is only correct It is economical with the reactor design and under the condition of a suitable reagent selection. A- H2SO4 B- HNO3 C- HCl 1. Write down all the reactions that will occur for these acids. 2. Describe which acid (s) you prefer for the application and why. 3. As a result of the use of the reagent you intend to use in the application The time t, where you would assume a total of 20 moles of metal dissolved in real terms as a result, the maximum amount of silver and copper that can be found in solution Calculate the concentrations.An unknown cadmium(II) solution was analyzed. A 25.00-mL sample of the unknown solution produced a diffusion current of 1.86 mA. Following addition of a 5.00-mL aliquot of 0.00212 M Cd2+ standard solution to the unknown solution, a diffusion current of 5.27 mA was produced. A) What type of electroanalytical method was used? B) What type of calibration method was used? C) What is the molar concentration of Cd2+ in the unknown solution?
- What are the advantages of a dropping-mercury electrode in polarography? Why is polarography used mainly to study reductions rather than oxidations?How anodic stripping voltammetry works for analysis of chromate. How is the analytical signal generated?The table shows a series of standard additions of Cu(II)to acidified tap water samples measured by anodic stripping voltammetry at a platinum electrode. The unknown and all standard additions were made up to the same final volume. a. What chemical reaction occurs during the stripping stage of the analysis?b. Plot absorbance as a function of the concentration of Cu (II) standard. Determine the equation of the line and the X intercept. Find the concentration of Cu(II) in the water.
- In an analysis of chromium in steel containing 1.76% Cr. 0.5000 g of that steel is weighed and dissolved in acid, whereupon the Cr is oxidized to Cr2O72- (dichromate), and blunt to a volume of 250 mL. A 10 mL aliquot of this solution is diluted with water and acid to a final volume of 100 mL. The resulting solution shows a transmittance of 41.7% in a 1 cm pathlength cell. When a 0.7500 g sample of unknown steel is dissolved in acid, oxidized, and diluted to 250 mL, the resulting solution exhibits a transmittance of 61.3% under identical experimental conditions. What is the percentage of Cr in the steel?Show detailed solution. A cell was prepared by dipping a Cu wire and a saturated calomel electrode into 0.10 M CuSO4 solution. The Cu wire was attached to the positive terminal of a potentiometer and the calomel electrode was attached to the negative terminal.(a) Write a half-reaction for the Cu electrode.(b) Write the Nernst equation for the Cu electrode.(c) Calculate the cell voltage.Describe the principle and operation of anodic stripping voltammetry (ASV). How does it differ from adsorptive stripping voltammetry? What is the quantitative signal?
- A polarogram with a dropping murcury electrode has a diffusion current of 18 microA. How much Zn2+ (in %) from 50.00 milliliters of 0.250mM solution is reduced during 2.8 minutes required to do the scan?Which is not true for electrogravimetric analysis? A. If the analyte has color in solution; The disappearance of the color indicates that the build-up is complete. B. If a qualitative test for a small sample of the analyte solution is positive, the analyte deposition is complete. C. The analyte is quantitatively deposited on an electrode by electrolysis. D. If the additional electrode surface is exposed to the solution and there is no further deposition, the deposition of the analyte is complete.When using ion-selective electrodes, to comensate for a complex or unknown matrix, the __________ method can be used to determine the analyte concentration. a) least-squares analysis b) standardization c)standard addition d)dilution e)calibration curve
