One of the types of first generation pesticides contained arsenic. An analytical analysis for arsenic was to convert to AsO4-3 and precipitate with Ag+, yielding Ag3AsO4(s). What is the oxidation state of arsenic in this precipitate? Group of answer choices -5 -3 0 +3 +5
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One of the types of first generation pesticides contained arsenic. An analytical analysis for arsenic was to convert to AsO4-3 and precipitate with Ag+, yielding Ag3AsO4(s). What is the oxidation state of arsenic in this precipitate?
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- In the chemical changes experiment on copper, which of the steps can be omitted if the goal is only to obtain dry copper (II) oxide solid? a. Addition of NaOH to Cu(NO3)2 solution. b. Boiling of the previous solution until black c. Decanting and adding sulfuric acid to dissolve black precipitate d. Filtering and heating until dry and fully blackChromium sulfate is an inorganic compound used as a tanning agent for leather manufacturing. It is produced after the reduction of potassium dichromate. The potassium dichromate is treated with 80% aqueous sulfuric acid solution and 20% excess H2O2 by the following reaction: K2Cr2O7 + 4 H2SO4 + 3 H2O2 à K2SO4 + Cr2(SO4)3 + 7 H2O + 3 O2 Analysis of the product mixture shows 40.21% Cr2(SO4)3, 4.11 % K2Cr2O7, 23.21% H2O. On a basis of 1000 kg of product mixture, determine the following: (a) Limiting reactant and excess reactants (b) % Excess of ER (c) Degree of completion (d) Illustrate The Law of Conservation of Mass (e) Complete mass composition of product mixturePyrolusite (MnO2) is dissolved in hydrochloric acid: MnO2 + HCl → MnCl 2 + H2O + Cl 2 The chloride was passed into potassium iodide solution where it liberated iodine: 2 2 Cl + KI → KCl + I The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 2 Na2 S2O3 NaI Na2 S4O6I + → +If 5.6 g of crystallized sodium thiosulfate,Na2 S2O3 5H2O, were used up, how many grams of manganese were present? MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32
- Mass of KxFe(C2O4)y · zH2O : 5.60 g Mass of sample : 0.155 g Mass of FeCl3 used in preparation : 1.60 g Molarity of standard NaOH used : 0.100 V1, volume of standard NaOH required for first equivalence point : 9.000 mL V2, volume of standard NaOH required for second equivalence point : 15.90 mL Calculate the percent of iron in the sample :Five white, 500-mg uncoated ascorbic acid (AA) tablets with an average weight of 0.6152-g were pulverized in a mortar. A sample of the powdered ascorbic acid weighing 0.4700-g was placed in an iodine flask and was dissolved in 50-mL H2SO4 then 5-g of KBr was added to the resulting solution. The solution was titrated with 47.81-mL of 0.09640 N STD. KBrO3 to reach a faint yellow endpoint then 3-g KI and 5-mL Starch TS. The blue color solution is then titrated with 2.73-mL of 0.09123 N STD. Na2S2O3 to reach the disappearance of the blue iodostarch complex. MW: KBrO3 = 167.0 ; KIO3 = 214.0 ; Na2S2O3 = 158.11 ; C6H8O6 = 176.12 Compute the milligrams of pure AA per tablet from the assay. 293.3 mg 502.5 mg None of the choices 383.9 mg3I- + OCl- + 2H+ ----> I3- + Cl- + H2: A 25.00 ml sample of liquid bleach was diluted to 1000 ml in a graduated flask. A 25 ml portion of the diluted sample was pipetted into an Erlenmeyer flask and treated with excess KI to oxidize OCl- to Cl- and I3- was produced at the end of the reaction. The released I3 was titrated with 0.09892 M Na2S2O3 and 8.96 ml was spent to reach the turning point besides the starch indicator. What is the percent by weight/volume of NaOCl in the bleach sample? (NaOCl:74.44 g/mol)
- Mass of KxFe(C2O4)y · zH2O : 4.70 g Mass of sample : 0.175 g Mass of FeCl3 used in preparation : 1.60 g Molarity of standard NaOH used : 0.100 V1, volume of standard NaOH required for first equivalence point : 7.750 mL V2, volume of standard NaOH required for second equivalence point : 19.70 mL Calculate the mass of iron in the sample : Calculate the percent of iron in the sample :Mass of KxFe(C2O4)y · zH2O : 5.60 g Mass of sample : 0.155 g Mass of FeCl3 used in preparation : 1.60 g Molarity of standard NaOH used : 0.100 V1, volume of standard NaOH required for first equivalence point : 9.000 mL V2, volume of standard NaOH required for second equivalence point : 15.90 mL Calculate the mass of iron in the sample :The digestion of a 0.1159 gram sample of a phosphorous-containing compound in a mixture of HNO3 and H2SO4 resulted in the formation of CO2, H2O, and H3PO4. Addition of ammonium molybdate yielded a solid having the composition (NH4)3PO4·12MoO3 (FW = 1876.3). This precipitate was filtered, washed, and dissolved in 50.00 mL of 0.2000 M NaOH: (NH4)3PO4•12MoO3(s)+26OH-(aq)->HPO42-(aq)+12MoO42-(aq)+14H2O(l)+3NH3(g) After the solution was boiled to remove the NH3, the excess NaOH was back-titrated with 14.84 mL of 0.1626 M HCl to a phenolphthalein end point. Calculate the percent phosphorous (FW = 30.9737) in the sample.
- To determine the concentration of an EDTA solution, the following magnesium(II) solution is prepared: metallic magnesium (m(Mg) = 0.5915 g) is dissolved in dilute sulfuric acid, the resulting solution is poured into a volumetric flask with a volume of 0.250 L and is filled to the graduation mark with water. The titration of an aliquot of magnesium(II) solution with a volume of 25.00 ml consumes (11.11 ml; 11.32 ml; 11.24 ml; 11.29 ml) of EDTA. Calculate the concentration of EDTA solution with accuracy corresponding to the starting data, give confidence interval.1. Why are Ce4+solutions never used for the titration of reductants in basic solutions?0.6025-g sample was dissolved, and the Ca 2+ and Ba 2+ ions present were precipitated as BaC2O 4 . H2O and CaC2O4 . H20 . The oxalates were then heated in a thermo gravimetric apparatus leaving a residue that weighed 0.5713 g in the range of 320°C to 400°C and 0.4673 gin the range of 580°C to 620°C. Calculate the percentage Ca and percentage Ba in the sample.