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- Absorbance Beer-Lambert's Law (Spectrophotometry) #2 To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and some inert materials, solutions with known [Co"] are prepared and the absorbance of each of the solutions is measured at the wavelength of optimum absorbance. The data are used to create a calibration plot, shown below. 0.80 0.70- 8 0.60- 0.50- 0.40- 0.30 0.20- 0.10- ++- 0.015 Concentration (M) A 0.6 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted with 2+ water to a final volume of 50.00 mL. Assume that all the cobalt in the ore sample is converted to Co'(aq). a. What is the (Co] in the solution if the absorbance of a sample of the solution is 0.74? b. Calculate the number of moles of CoT(ag) in the 50.00 mL solution. 2+ C. Calculate the mass percent of Co in the 0.630 g sample of the ore.JL alt ctrl ins del NAME SECTION DATE POSTLABORATORY ASSIGNMENT "barium/calcium/magnesium" unknown solution and aqueous (NH4)2SO4 produced a white precipitate that gave a green flame test. After centrifuging and decanting, the addition of aqueous (NH4)2C2O4 produced a white precipitate that gave a brick-red flame test. After centrifuging and decanting, the addition of aqueous Na2HPO4 and NaOH gave no reaction. State the cation(s) confirmed present and absent in the unknown solution. Cation(s) present Cation(s) absent 2. A "barium/calcium/magnesium" unknown solution gave no reaction with aqueous (NH4)2SO4, or aqueous (NH4)2C2O4. Adding aqueous Na2HPO4 and NaOH gave a white precipitate. After dissolving the precipitate in HCI, and adding magnesium reagent, the solution gave a clear blue gel precipitate. State the cation(s) confirmed present and absent in the unknown solution. Cation(s) present Cation(s) absent4.Determination of hardness by clark's test
- Q. Determination of hardness by Clark's method.A is the snort electran canfiquretiCA Fe2+Question 8 Carbowax column means the stationary phase used is O 50% phenyl polydimethyl siloxane O polyethylene glycol O 5% phenyl polydimethyl siloxane O 50% cyanopropyl polydimethyl siloxane Question 9 The separation of GLC is based on ; and the separation of GSC is based on O adsorption; partition O adsorption; adsorption O partition; partition O partition; adsorption
- A spectrophotometric method for the analysis of iron has a linear calibration curve for standards of 0.00, 5.00, 10.00, 15.00, and 20.00 ppm. An iron ore sample with an expected iron content of 40–60% w/w is to be analyzed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum of concentrated HCl, and diluted to 1 L in a volumetric flask using distilled water. A 5.00-mL aliquot is removed with a pipet. To what volume (10, 25, 50, 100, 250, 500, or 1000 mL) should it be diluted to minimize the uncertainty in the analysis? Explain.Two methods were applied to measure and test the standard reference materials of chromium. Quantity Method 1 Method 2 Mean Value (ppm) Standard deviation (ppm) Number of measurements 0.0826052 0.0000134 0.082005 0.000129 5 6. Are the standard deviations significantly different? Are the mean significantly different at the 95% confidence level?D. Is the nucleophile strong or weak? E. Is the solvent polar protic or polar aprotic? F. What type of substitution reaction is favored under these conditions: SN1 or Sn2?
- Which of the following statement(s) is (are) true regarding hydroxyapatite (HA)? In orthopedic applications, HA serves as the support-providing component of the O implant and metals are used as a coating layer to promote osteoconduction. b)HA is resorbable polymer with an adjustable in vivo resorption rate. c. The stoichiometry of synthetic HA, i.e. O Ca/P (mol. ratio) =1.67, is not exactly the same as that of the native bone mineral. O d.All of the aboveWhat is DEPT used for?Questions 11 and 12 refer to the same set of absorbance readings that were taken on metal-EDTA complexes in a different solution known to contain cobalt and nickel. The cuvette width is 1.00 cm. Given the following, what is the concentration of Co2+ in solution? (Four decimal places) Given the following, what is the concentration of Ni2+ in solution? (Four decimal places)