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- A 100-mL sample of hard water is titrated with the EDTA solution in Problem 2. The same amount of Mg2 is added as previously, and the volume of EDTA required is 31.84 mL. a. What volume of EDTA is used in titrating the Ca2 in the hard water? _____________mL b. How many moles of EDTA are there in that volume? _____________ moles c. How many moles of Ca2 are there in the 100 mL of water? _____________ moles d. If the Ca2 comes from CaCO3, how many moles of CaCO3 are there in one liter of the water? How many grams of CaCO3 are present per liter of the water? _____________ mol / L _____________ g / L e. If 1 ppm CaCO3 = 1 mg per liter, what is the water hardness in ppm CaCO3? _____________ ppm CaCO3A standard solution is a solution of accurately known concentration. What is a standard solution for titrating sulfuric acid in acid-alkali titration? a) Alkali such as sodium hydroxide b) Any alkali and acids c) Salt such as sodium chloride d) Acid such as hydrochloric acidPrecipitation Titration (Argentimetry) All of the following is true regarding Argetometric titration method except: a) The method can be used for determination of Br and I b) AgNO, is the titrant and it is not a primary standard c) In Fajan's method excess amount of AgNO, is added then back titrated with Thiocyanate d) Different methods can be used for detecting the end point e) Fajan's method depends on using fluorescence indicators such as Dichlorofluorescine
- What species are present in a solution giving off a pure blue endpoint in a hard water sample containing an EBT indicator (In) with an EDTA titrant? a. HIn²⁻, CaY²⁻, MgY²⁻ b. HIn²⁻, MgIn⁻, CaY²⁻, MgY²⁻, CaIn⁻ c. HIn²⁻, MgIn⁻ d. HIn²⁻, MgIn⁻, CaY²⁻An HCl solution was titrated to determine its concentration using 15.00 mL 0.02500 M sodium carbonate standard solution. It required exactly 20.000 mL acid to completely neutralize the reaction between the titrant and analyte. What is the concentration of HCl solution? a 0.06667 M b 0.03750 M c 0.01875 M d 0.03333 M21. What materials contain a precisely known concentration of a substance typically used in quantitative analysis? A. ACS grade MaterialsB. Chemical Standard MaterialsC. IUPAC Standard MaterialsD. PIPAC Standard Materials22. Which type of curve is normally produced when plotting the change in the concentration of a specie of some function and the amount of reagent added?A. Titration curveB. Sigmoidal CurveC. Phase Transition curveD. Calibration curve23.In the dead dear case study, silver diethyldithiocarbamateforms a colored solution when it binds with arsenic, what do we call substance like silver diethyldithiocarbamate?A. Secondary standard reagentB. Precipitating agentC. Chelating agentD. Primary standard reagent24.What important analytical method is employed that include analysis of standard reference materials when available, analysis by a different analytical method, analysis of “spiked” samples, and analysis of synthetic samples approximating the chemical composition of the…
- A 0.3285 g sample containing chloride and inert material is titrated with 0.1012 M AgNO3, requiring 34.99 mL to reach the Ag,Cro. end point. Titration of a blank sample consumes 0.32 mL of the AgNO, titrant. Determine the % w/w chloride in the sample.Which is the correct order of steps in the preparation of a hydrochoric acid standard solution with sodium bicarbonate standard solution. I. Dissolved sodium carbonate (13.25 g) in about 150 mL of distilled water in a beaker II. Solution of sodium carbonate was transferred into a volumetric flask and diluted to mark before mixing. III. Weigh the appropriate amount of the primary standard. IV. Titrate with enough volume of the acid to completely neutralize the base. V. Transfer 10.00 ml primary standard into an erlenmeyer flask and add indicator III, I, II, V, IV III, II, I, V, IV V, III, I, II, IV V, IV, III, I, IIDetermine the % w/w chloride in the sample. A 0.3285 g sample containing chloride and inert material is titrated with 0.1012 M AgNO3, requiring 34.99 mL to reach the Ag2CrO4 end point. Titration of a blank sample consumes 0.32 mL of the AgNO3 titrant.
- Which of the following statements CORRECTLY describes a EDTA titration? a. All statements are correct. b. Erichrome black T has the same endpoint with Calmagite indicators and its solution is more stable than the Calmagite. c. EDTA titration can be used only for direct titration methods. d. EDTA Titration can be used in determination of all cations. e. EDTA titration is usually used in the determination of water hardness.What is standard solution ? Why is a standard solution necessary for titration?What happens when a non-standard titrant is used in the titration of an unknown sample?a - The volume of the acid used will not be accurate.b - The normality of the acid used will not be accurate.c - The weight of the analyte will not be accurate.d - It will not matter.