Unknown Number Color in H₂O 3 purple Unknown Spot(s) Color in Ammonia Spot #1 Spot #2 Spot #3 Blue yellow N/a Color after CaS (aq) Black yellow N/A Distance Spot Moved 57cm 5cm N/A Distance Solvent Front Moved 7.8 cm 6.5cm NA Calculated R 0.8974 0.76923 N/A Identity of Metal Ion
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- The equilibrium constant for the conjugate acid-base pair HIn+H2OH3O++In is 8.00 10-5. From the additional information in the following table, (a) calculate the absorbance at 430 nmand 600 nm for the following indicator concentrations: 3.00 10-4M,2.00 10-4M, 1.00 10-4M, 0.500 10-4 M, and 0.250 10-4M. (b) plot absorbance as a function of indicator concentration.Sudies have revealed extremely high deposits of heavy metals and paryiculate matterin rivers , making them unwholesome for drinking. With your on analytical separation and analyses, outline a suitable analytical separation protocol that can be employed to recover polluted river bodies and make wholesome for drinking. Explain in details.Write balanced net ionic eqautions for (include phase subscripts): Ag+ and 0.5M Na2SO4 Ba2+ and 0.5M Na2SO4 Ba2+ and 0.5M Na2S2O3 Cu2+ and 0.2M NaI Pb2+ and 0.2M NaI Cu2+ and 0.2M NH3 Cu2+ and 6M NH3 Fe3+ and 6M NH3
- You have a sample of approximately 100 mg/L of calcium carbonate and the standardized EDTA has a concentration of 0.00085 M. If you only want to spend approximately 15 mL of the titrant and add 25 mL of sample in the Erlenmeyer flask, can you use it or should you dilute it? the sample?, how much? Solution: No, 29 mL would be needed to titrate the sample, you must dilute it approximately 1: 2. Taking, for example, 25 mL of sample and making up to 50 mL.A 350.00 mL solution of 0.00265 M A3B4 is added to a 280.00 mL solution of 0.00205 M C3D2. What is pQsp for A3D4?EDTA abstracts bismuth(III) from its thiourea complex:Bi1tu2631 1 H2Y22 S BiY2 1 6tu 1 2H1where tu is the thiourea molecule (NH2)2CS. Predict the shape of a photometric titration curve based on thisprocess, given that the Bi(III) or thiourea complex is the only species in the system that absorbs light at 465nm, the wavelength selected for the analysis.
- 4. The molar absorptivities of the indicator weak acid HIn (K_{a} = 1.42 * 10 ^ - 5) and its conjugate base In at 570 were determined as epsilon(HIn) = 7120 and ε(In) = 961. The optical length b = 1.00 cm. (a) What is the absorbance of an unbuffered indicator solution having total indicator concentration 8.0 * 10 ^ - 5 (b) What is the absorbance of a buffered indicator solution having total indicator concentration 8.0 * 10 ^ - 5 and pH = 6.5 .A solution of altura red of concentration 307 ppm gives an absorbance of 0.616. What concentration is a solution of allura red which gives an absorbance reading of 0.261? The same cell (cuvette) with a path length of 1.000 cm is used for both readings. Report your answer to the nearest whole number without units? Hint: A=abc, where c can have any concentration units. dont provide handwriten solutionIn this activity, you will develop an experimental procedure to solve a problem. Consider the followingscenario:You are the manager of a chemical stockroom, and find a bottle containing approximately one liter of aclear and colorless solution of unknown identity and concentration. Your only clue to its identity is thatit was found between bottles of silver fluoride and sodium fluoride, so it is likely an aqueous solution ofone of those two compounds. You will need to develop a procedure to determine the following:a) The identity of the unknown solutionb) The concentration of the unknown solutionWrite out a precise procedure, which includes all glassware, reagents, and steps. You will also need towrite the calculations that you would need to determine the concentration of the solution. Assume thatyou have access to any reagent you might need
- One gram of sodium hydroxide (NaOH) is used to adjust the pH of an aqueous solution (200 gallons) thatcontains 10 lbs of finely ground rhodochrosite (MnCO3) ore. Does the NaOH raise or lower the solutionpH? What is the amount of NaOH added in lbs/ton? What is the molarity (mol/l) of the system? Assumingthe NaOH is completely soluble and the system is at room temperature, what is the solid-to-liquid ratio(wt%) of the system?An EDTA solution was prepared by dissolving approximately 4g of the disodium salt in approximately 1L of water. An average 12.35mL of of this solution was required to titrate 50.00mL aliquots of a standard that contained 0.07682g of MgCO3. Titration of a 25.00mL sample containing MgCl2 at pH 10 required 18.81mL of the solution. Calculate the molar concentration of MgCl2 in the sample.The commercial production of nitric acid involves thefollowing chemical reactions:4 NH31g2 + 5 O21g2¡4 NO1g2 + 6 H2O1g22 NO1g2 + O21g2¡2 NO21g23 NO21g2 + H2O1l2¡2 HNO31aq2 + NO1g2 (a) Predict what kind of reaction dopamine is most likely toundergo in water: redox, acid-base, precipitation, or metathesis?Explain your reasoning. (b) Patients with Parkinson’sdisease suffer from a shortage of dopamine and may need totake it to reduce symptoms. An IV (intravenous fluid) bag isfilled with a solution that contains 400.0 mg dopamine per250.0 mL of solution. What is the concentration of dopaminein the IV bag in units of molarity? (c) Experiments withrats show that if rats are dosed with 3.0 mg/kg of cocaine(that is, 3.0 mg cocaine per kg of animal mass), the concentrationof dopamine in their brains increases by 0.75 mM after60 seconds. Calculate how many molecules of dopaminewould be produced in a rat (average brain volume 5.00 mm3)after 60 seconds of a 3.0 mg/kg dose of cocaine.