The thickness of the chromium plate on an auto fender is determined by dissolving a 30.0-cm2 section in acid and oxidizing Cr3+ to Cr2O7 2-with peroxydisulfate. After removing excess peroxydisulfate by boiling, 500.0 mg of Fe(NH4 )2 (SO4 )2•6H2O is added, reducing the Cr2O7 2- to Cr3+ . The excess Fe2+ is back titrated, requiring 18.29 mL of 0.00389 M K2Cr2O7 to reach the end point. Determine the average thickness of the chromium plate given that the density of Cr is 7.20 g/cm3

Q: Compare the solubility of ferrihydrite (Fe(OH)3) and goethite (FeOOH), with dissolution reactions…

A: Ferrihydrite (Fe(OH)3): Fe(OH)3 + 3 H+ →Fe3+ + 3 OH- + 3 H+Let s1 be the solubility of…

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A: Chemical equation is the equation in which the chemical reaction is represented. All the reactant…

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Q: Which aqueous vanadium species, H2VO4- or V(OH)2+, would be preferentially adsorbed onto…

A: The vanadium species H2VO-4 is known as vanadate and the V(OH)+2 is called vanadium hydroxide.…

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A: Energy absorbed can be calculated using following equation: E = Nahc/λ Where, λ is the wavelength…

Q: snip

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Q: When fusing with resorcinol and adding ammonia to the alloy, a solution with green fluorescence…

A: Fluorescence is the phenomenon of light emission by a substance that has previously absorbed light…

Q: Using Cu-Ka radiation (I = 154 pm), The Bragg angle is 22.2 for the (110) type planes for a BCC…

A: The analysis of the above question provides insights into the interaction of X-ray radiation with…

Q: A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate…

A:

Q: lon glve - produce an alloy phase consisting of Fe,C and Mn,C only. An amount of Cao hich is equal…

A:

Q: In isomorphous alloying systems; the two metallic elements are totally dissolved in each other at…

A: In an isomorphous alloying system; the two metallic elements are completely miscible in each other…

Q: Explain why does conductivity of germanium crystals increase on doping with galium.

A: Gallium is a trivalent element while germanium is tetravalent

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A: Grain boundaries are two-dimensional imperfections found in the crystal structure of polycrystalline…

Q: The synthesis of spinel Mg, TiO can 2 4 be achieved by heating TiO with 2 MgO at 1400 °C over a…

A: Given that the synthesis of the spinel Mg2  TiO4 can be achieved by heating TiO2  with MgO at…

Q: balance the reaction in acidic soln VO₂+ + Zn ➖➖➖➖➖ > VO+² + Zn+²

A: To balance this overall reaction we will first write oxidation half and reduction half reaction and…

Q: Show the process of copper electroless plating on iron rod using EDTA stabilized copper sulphate and…

A: A reaction is a spontaneous reaction when the corresponding Gibb's free energy change is negative.

Q: lire chemical formulas and dimensional analysis to express the ratio for the calculation of the…

A: H2NNH2 + 2I2 = N2 + 4I- + 4H+…

Q: escribe the difference between the Resistance and Resistivity. (2) Wh= iton and Dolaron2 Explain in…

A:

Q: What is species of a mineral

A: naturally occurring inorganic substances with particular arrangement of atoms with definite chemical…

Q: If 22.29 mL of 0.02901 M EDTA is required to tirate 100.0 mL of spring water, then calculate the…

A: Molarity - ratio of number of moles of solute to the volume of solution in litres. Formula is,…

Q: True or False Leaching of PbCl₂ is ensured when known solution of Group I cations stays hot.

A: Please see explanation.

Q: (i) You have been provided with a sample collected from a water pool beside a slag heap at the iron…

A: we can use the Beer-Lambert law to calculate the concentration of Fe(II) in the sample: A = ε l c…

Q: Reactions 5 and 6 (occur simultaneously): Zn metal added to CuSO4(aq)     Balanced Equation for…

A: This is a type of displacement reaction. Zn metal displaces Cu from copper sulphate solution. Zn(s)…

Q: In this experiment, it was necessary to assume that [FesCN^ 2+ ] std was equal to [SCNJinitial.…

A: In the experiment, the following system is under equilibrium: Fe3+ (aq) + SCN-(aq) ⇔ Fe(SCN)2+…

Q: Previous records had shown that to prevent acute toxicity to organisms, the maximum mass of CdSO4…

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Q: Under standard conditions (250 C, 1.0 atm): i. If Cr metal is immersed in a solution of Zn(NO3)2,…

A:

Q: Describe the principle involved in each of the following processes :(i) Zone refining of metals(ii)…

A: (i) Zone Refining of metals : The principle of zone refining is based on the principle that…

Q: Describe the principle controlling each of the following processes :(i) Vapour phase refining of…

A: Vapour phase refining method: It is refining process in which metallic ore is converted into its…

Q: Show the process of copper electroless plating on iron rod using EDTA stabilized copper sulphate and…

A: For a reaction to be spontaneous the corresponding Gibb's free energy change is negative.

Q: Give a clear handwritten answer...

A:

Q: The Ksp at 298 K for iron(II) fluoride is 2.4 * 10-6. (a) Write a half-reaction that gives the…

A: The compound given is iron (II) fluoride i.e FeF2.

Q: State the principle on which each of the following processes operates: (i) Recovery of silver after…

A: To eliminate pollutants from the metals the way toward refining is finished. The extensively…

Q: None

A: Step 1:The K-edge absorption energies (also known as K-shell binding energies) are the energies…

Q: Use the following data to determine if Cr²⁺(aq) can be pre-pared by the reaction of Cr(s) with…

A: The preparation of Cr?- (aq) from Cr(s) and Cr3+ (aq) can be done as given below; (1) Cr3+ (aq) + e-…

Q: A sedimentary rock sample with mass 0.7600 g gave an ignited residue of mixed oxides, SeO, and As2O3…

A:

Q: Outline the principles of refining of metals by the following methods :(i) Distillation(ii) Zone…

A: (i) Distillation: Zinc and Mercury have an extremely low boiling point. So on heating them they very…

Q: Why in packed columns, all three terms contribute to band broadening, but in open tubular columns, A…

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Q: possible ways in which Cu2+ could sorb to a hematite surface

A: Sorption methods for purifi cation of contaminated natural and wastewater have been fi nding…

Q: (a) Write the principle of electrolytic refining.(b) Why does copper obtained in the extraction from…

A: Write the principle of electrolytic refining.

Q: Describe the principle behind each of the following processes: (i) Vapour phase refining of a metal.…

A: To eliminate pollutants from the metals the way toward refining is finished. The extensively…

Refining of Crude Metal

Metallurgy could be defined as a technique by which metals can be extracted in their pure nature. Extractive metallurgy directs with the route of eradicating the valuable metals from ores and purifying the extracted metals to pure nature. In hydrometallurgy, the metal extraction’s from their ores is done using an aqueous solution. In the pyrometallurgical process, high temperatures are employed to initiate the reactions between gases, molten metals, and solids. In electrometallurgy, the technique is carried in an electrolytic cell.