20 ml aliquot of drinking water containing Fe(II) and Fe (III) is treated with hydroquinone to reduce all dissolved iron to Fe(II),0- phenanthroline is added and the aliquot is diluted to 50 ml and the absorbance in a 2.00 cm cell is 0.085 at 510 nm. Calculate the iron content of the water as ppm? ε = 1.11 x 104 L/mol cm

Q: 2. What is the solubility of lead (in pM) for solid Pb(OH)2 in a sample of water containing 2.4 x…

A:

Q: Write a balanced equation for the reaction of Al(H2O)63+in aqueous KF.

A: Write a balanced equation for the reaction of Al(H2O)63+ in aqueous KF.

Q: A 0.7352g sample of ore containing Fe3+, Al3+ and Sr2+ was dissolved and made up to 500.00 mL. The…

A: Given: mass of ore = 0.7352 g Concentration of EDTA = 0.02145 mol/L At pH = 1.0, the volume of EDTA…

Q: Metal ions in aqueous solutions are solvated, or hydrated, by water molecules. Typically this…

A:

Q: 0.8153 g of a sample containing Pb(NO3)2 was taken, dissolved in water, and 40.20 mL of 0.06 M EDTA…

A: A multiple choice question based on EDTA titration, which is to be accomplished.

Q: 5) The oxides and hydroxides of gallium exhibit both acidic and basic behaviors B) What is pCa for a…

A: Gallium metal is stable in dry air. It gradually oxidizes in moist air to form a protective film…

Q: A 0.9352g sample of ore containing Fe³+, Al³+ and Sr²+ was dissolved and made up to 500.00 mL. The…

A: A numerical problem based on concentration terms that is to be accomplished.

Q: Use the following atomic masses (in g/mol): Ca = 40.08; C = 12.01; O = 16; Na = 23; Cl = 35.45…

A: 200 mg sample of pure calcium carbonate was acidified and dissolved in 500 mL of solution. A 50 mL…

Q: A 2.5 x 10 M solution of a colored complex in a 1.00 - cm cell has an absorbance of 0.300. What is…

A: Interpretation -  To determine the absorptivity ( in L/mole-cm) when a 2.5 ×10-4 M solution of a…

Q: (a) Corrosion is essentially an electrochemical phenomenon. Explain the reactions occurring during…

A: The redox reactions are the reactions, which involves the transfer of electrons in the reactants. In…

Q: The pKsp of indium ferrocyanide, In4[Fe(CN)6]3, is 43.720. Calculate the solubility of indium…

A: Given,  pKsp of In4[Fe(CN)6]3 = 43.720  Molarity of InCl3 = 69.3 mM  Calculate the solubility of…

Q: Calculate the nickel ion concentration of a solution prepared by shaking Ni(OH)2 with water until…

A:

Q: A 1.963-g sample of an alloy is dissolved in HNO3 and diluted to volume in a 100-mL volumetric…

A: Answer: This question is based on stoichiometric calculation where moles of SCN- needs to be…

Q: Calculate the solubility of the slightly soluble salts of Cr(OH)2 and Cr(OH)3. What would you…

A: The question is based on the concept of solubility product Principle.   it states that a weak…

Q: Mass of KxFe(C2O4)y · zH2O : 4.70 g Mass of sample : 0.175 g Mass of FeCl3 used in preparation :…

A: Mass of KxFe(C2O4)y · zH2O : 4.70 g Mass of sample : 0.175 g Mass of FeCl3 used in preparation :…

Q: 0.500 g of an impure ammonium sulfate sample is dissolved in water and treated with an excess of…

A: The reaction that takes place is following: (NH4)2SO4 + 2NaOH --> NH4OH + Na2SO4. Ammonium…

Q: Write the cell notation of the potentiometric set-up with SCE as the reference electrode.   b)…

A: a) Anode II Cathode AgIAg+ IIHg2 cl2 IHg. cl-Anode 2Ag→2Ag+ +2e-CathodeHg2 cl2 +2e- →Hg+2cl- Solving…

Q: Auzure II is a dye with a molar absorptivity (ε657) of 8.13×104 L/mol·cm when measured at 657 nm.…

A: Given   Wavelength is 657 nm. Concentration is 4.50×10-6 M or 4.50×10-6 mol/L. Molar absorbtivity is…

Q: The oxidation of 25 mL of a solution containing Fe²+ requires 3.0 × 10¹ mL of 0.0315 M K₂Cr₂O7 in…

A: For balancing the reaction, look at the reaction closely, there are 2 Cr atom is present at the left…

Q: 0.7682 g MgCO3 is dissolved in 1000 mL water, 50 mL of this solution is taken and titrated with…

A: • Since, here is given that MgCO3 is taken as 0.7682 gm and its aqueous solution has been made in…

Q: We titrate 25.0 cm3 of 0.012 M K4[Fe(CN)6] solution with 0.020 M K3[Fe(CN)6] solution. What will be…

A: Fe is present in its +2 oxidation state in K4[Fe(CN)6], (which is the reduced form) and is present…

Q: eq• Calculate Keq-

A: 1. An equilibrium reaction is that reaction which can not go to 100% completion but is at a…

Q: was titrated in acidic medium, equal

A: Let molarity of KMnO4=xKMnO4+FeSO4 -> Fe2(SO4)3+Mn2+n=5          n=1

Q: In a redox titration, 20ml of completely oxidised by 12.5ml of 0.02mol/L acidified Fe(II)SO4 was

A: 1) In acidic medium K2Cr2O7 is OA (reduced)  and converts into Cr+3 ions  FeSO4 is RA (oxidized)…

Q: As part of a geological team that studied a local cave, you brought with you a bunch of 1.00 g rock…

A: The reaction taking place will be, MgOH2+EDTA4-  → MgOH2EDTA4- Calculate number of moles of EDTA: 1…

Q: To analyze the amount of iron (Fe; Mw =  55.85 g/mol) contained in an ore sample, the sample was…

A: Given in the question, Volume of EDTA = 25 ml Molarity of EDTA = 0.2922 M Total moles of EDTA =…

Q: What is the optimum pH for coagulation with Fe2(SO4)3? Briefly explain why.

A: Answer - Coagulation - Coagulation, in physiology, the process by which a blood clot is formed. The…

Q: 1. Sodium oxalate crystals (0.1234 g, MM=134) required 15.67 ml of KMNO, solution to titrate. Find…

A: the solution is as follows:

Q: Calculate the equilibrium constant for the reaction

A: the equilibrium constant is denoted by Kc. amounts of products divided by amounts of reactants; each…

Q: 0.7682 g MgCO3 is dissolved in 1000 mL water, 50 mL of this solution is taken and titrated with…

A:

Q: 10.00 mL of aqueous NaOCl is treated with excess potassium iodide, KCl, in an acidicsolution. The…

A: The objective of this question is to determine the molarity of the NaOCl solution. This can be done…

Q: A cyanide solution with a volume of 13.72 mL was treated with 25.00 mL of Ni2+ solution(which…

A: 4CN- + Ni2+ ----> Ni(CN)42-

Q: Write a balanced equation for the reaction of Al(H₂O)₆³⁺ in aqueous KF.

A: Introduction- Balanced Chemical equation- When the reactants and products of a chemical reaction…

Q: What is the color of the complex formed from the reaction of Co2+ and quercetin? Does the complex…

A: The reaction between Co2+ and  Quercetin yields a brownish yellow coloured complex at pH 6.4 using…

Q: As part of a geological team that studied a local cave, you brought with you a bunch of 1.00 g rock…

A: Given that -  Mass of sample of rock = 1.00 g  Molarity of EDTA Solution used = 0.050 M  Volume of…

Q: Chromel is an alloy composed of nickel, iron, and chromium. A 0.6392-g sample was dissolved and…

A:

Q: Which of the following compounds precipitates from a solution that has the concentrations indicated?…

A: a) Given: [Ca2+ ] = 0.003 M & [CO32- ] = 0.003 M

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.