3. The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL sample to 100.0 mL. A 20.00-mL portion of the diluted solution was refluxed with 40.00 mL of 0.04672 М КОН: CH3COOC2H5 + OH° ®CH3COO¯ + C2H5OH After cooling, the excess OH was back-titrated with3.41 mL of 0.05042 M H2SO4. Calculate the number of grams of ethyl acetate (88.11 g/mol) per 100 mL of the original sample.
Q: The Kjeldahl method was used to determine the nitrogen content of a soil sample. 25 g soil sample…
A: Mass of soil sample = 25 g Molarity of HCl = 0.05 M Volume of acid added = 10 mL Molarity of NaOH =…
Q: The digestion of a 0.1387-g sample of a phosphorus containing compound in a mixture of HNO, and…
A: Solution: Given: Mass of the sample containing phosphorus = 0.1387 gMolarity of NaOH solution =…
Q: The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid…
A:
Q: A chemist received different mixtures for analysis with the statement that they contained NaOH,…
A:
Q: The arsenic in a 2.345g sample of a pesticide was converted to H 3 AsO4 by suitable treatment. The…
A: Molarity is defined as the number of moles of solute per litre of the solution. It is denoted as M.…
Q: The tetraethyl lead Pb(C2H5)4 in a 25.00 mL sample of aviation gasoline was shaken with 15.00 mL of…
A:
Q: 25.0 mL aliquots of a 0.106 mol/L Sn2+(aq) solution was used to standardize an acidified potassium…
A: Titrations are carried out in chemical laboratories to discover concentration of unknown solutions…
Q: A 11.00 gram sample of Vodka was analysed for its alcohol content. The sample was placed in a300 mL…
A: The volume of 1.00 L is equal to 1000. mL. The number of mole (n) of Cr2O72- is calculated as shown…
Q: The tetraethyl lead Pb(C2H5)4 in a 25.00 mL sample of aviation gasoline was shaken with 15.00 mL of…
A: Calculate the initial number of moles of iodine. n = C × VnI2 = CI2 × VI2nI2 = 0.02179 M × 0.015…
Q: Addition of 50.00 mL of 2.238 m H2SO4 (solution density = 1.1243 g/mL) to 50.00 mL of 2.238 M BaCl2…
A:
Q: The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL…
A: Answer is given below
Q: The amount of ascorbic acid, C6H8O6, in orange juice was determined by oxidizing the ascorbic acid…
A:
Q: 6.) 200.0 mL of a 0.435 M Mg(NO3)2 solution was mixed 300.0 mL of 0.715 M NaOH solution. This…
A: Volume of Mg(NO3)2 = 200ml Concentration of Mg(NO3)2 = 0.435M Volume of NaOH = 300ml Concentration…
Q: Rei and Akari, two vinegar enthusiasts, are each tasked to determine the acetic acid content of…
A: Given: mass of KHP = 0.540 g Volume of KHP stock solution = 10.0 mL Volume of diluted KHP solution =…
Q: 0.6025-g sample was dissolved, and the Ca 2+ and Ba 2+ ions present were precipitated as BaC2O 4 .…
A: Note the dehydration equation of calcium oxalate and barium oxalate.…
Q: The Merck Index indicates that 10 mg of guanidine, CH5N3, may be administered for each kilogram of…
A:
Q: Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product…
A: Spectrophotometry is a technique used in quantitative analysis to determine the concentration of the…
Q: The tetraethyl lead Pb(C2H5)4 in a 25.00 mL sample of aviation gasoline was shaken with 15.00 mL of…
A: The question is based on the concept of quantitative analysis. we have to quantitatively estimate…
Q: A 10.00 mL sample containing 8.00 g/L of a mixture of KCI and NaCl was titrated with 0.10 M standard…
A: Given: Volume of sample = 10.00 mL = 0.010 L (Since 1 L = 1000 mL)…
Q: Calculate the weight of pure sodium carbonate that is necessary to prepare 2.806 L of 0.223 N…
A: We need to find molarity of the solution . We assume molar mass of sodium-carbonate in 106 g/mol,…
Q: 1. (10) The amount of protein in a sample of cheese can be determined by Kjeldahl analysis for…
A: Answer:- this question is answered by using the simple concept of stoichiometry which involves the…
Q: A 0.4435-g sample of impure Na2CO3 (FW 105.99) was analyzed by the Volhard method. After adding…
A:
Q: A sample of freshly precipitated and filtered silver chloride weighs 459.0 mg. If 1.00 % of the…
A: The chemical equation representing the decomposition reaction of silver chloride is shown below.
Q: one trial of the standardization of a Na2S2O3 solution, a 10.00 mL volume of 5.00×10-3 M KIO3 is…
A: Given Taken 10.00 mL volume of 5.00×10-³ M KIO3 15.96 mL of sodium thiosulfate solution We have…
Q: A sample of solid Ca(OH)2 was stirred in water at a certain temperature until the solution contained…
A: Given, Volume of Ca(OH)2, V1 =450 mL=450×10-3L=0.450 L Molarity of Ca(OH)2 M1= to find Valency…
Q: An analysis for borohydride ion is based on its reaction with Ag+: BH4- + 8Ag+ + 8OH--> H2BO3- +…
A:
Q: A 0.3147-g sample of a primary-standard grade Na2C2O4 was dissolved in dilute H2SO4 and titrated…
A: According to the mole concept, in terms of mass, the amount of substance in moles is equal to the…
Q: 2每張試題卷得必填寫(學號)、(姓名) The ethyl acetate concentration in an alcoholic solution was determined by…
A: Question 11 is not related with the given problem.
Q: The thiourea in a 1.455 g sample of organic material was extracted into a dilute sulfuric acid…
A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…
Q: 0.7050-g of pure KHP (FW = 204.2) was dissolved and titrated with 35.00mL of NaOH solution. The…
A:
Q: A sample weighing 0.6760 g that contains an unknown amount of BaCl₂ was completely dissolved in…
A:
Q: Rei and Akari, two vinegar enthusiasts, are each tasked to determine the acetic acid content of…
A: Given: mass of KHP = 0.540 g Volume of KHP stock solution = 10.0 mL Volume of diluted KHP solution =…
Q: A 0.1093-g sample of impure Na2CO3( Molecular weight 106) was analyzed by the Volhard method. After…
A: Given: 1) The reaction taking place: Na2CO3 + 2AgNO3 → Ag2CO3 + 2NaNO3 2) The reaction of KSCN with…
Q: 106. The following procedure calls for the assay of Sodium bicarbonate tablets 1) Triturate 10 pics…
A: When titrating acid and base, a neutralisation reaction takes place. Here, sulfuric acid and sodium…
Q: molar concentration of the acid
A:
Q: The nitrogen and protein content of a 0.757 g sample of flour sample was analyzed using Kjeldahl…
A:
Q: Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product…
A: The expression of beer's law is shown below: A = ε c l where; A = absorbance c = concentration l =…
Q: Use the following atomic masses (in g/mol): Mg = 24.31; H = 1; S = 32.06; O = 16; Na = 23; Cl = 35.…
A: Molecular mass of Chlorpheniramine Maleate: 390.9 g/mol Molecular mass of perchloric acid: 100.46…
Q: The ethyl acetate concentration in a alcoholic solution was determined by diluting a 10.00 mL sample…
A:
Q: A K2SO4•Al2(SO4)3•24H2O preparation is tested for its purity by converting first to Al(OH)3 then…
A: The answer and explanation is as given below:
Q: The ethyl acetate concentration in an alcoholic solution was determined by diluting a 10.00-mL…
A: Solution No.of moles of KOH is , n = Molarity * Volume in L…
Q: The SO2 present in air is mainly responsible for acid rain. Its concentration can bé determined by…
A: Molarity of the solution is equal to the number of moles of solute present in one liter of the…
Q: An unknown sample weighing 1.5098 g was acidified with 3.0 M H2SO4 to dissolve the copper compounds…
A: H2SO4 converts all the Cu(s) present in the unknown sample into Cu2+(aq).
Q: If 110.0 mL of 0.0030 MNa2SO4(aq) is saturated with CaSO4, how many grams of CaSO4 would be present…
A: Given: Concentration of Na2SO4 = 0.003 M And volume of solution = 110.0 mL = 0.110 L…
Q: Oxalic acid dihydrate (H2C204 2H2O) can be used to standardize NaOH solution through acid-base…
A: During titration, number of moles of base and number of moles of acid should be equal. In the…
Q: A 0.6883 gram sample of impure potassium chlorate was treated with 45.00 mL of 0.1020 M…
A:
Q: 2. An analysis for borohydride ion is based on its reaction with Ag+: BH4 - + 8Ag+ + 8OH- -> H2BO3 -…
A:
Q: Under these conditions the acid acetylsalicylic (MW, 180) reacts according to: CH3COO-C6H4-COOH + 2…
A: To analyze an aspirin sample, 0.3470 g of crushed tablets are weighed and treated with 50.00 mL…
Q: A 516.7-mg sample containing a mixture of K,SO, and (NH4),SO4 was dissolved in water and treated…
A: Given, Mass of sample : 516.7 mg=516.7×10-3 g BaSO4 yield = 863.5 mg
Q: The amount of ascorbic acid, C6H8O6, in orange juice was determined by oxidizing the ascorbic acid…
A: Iodometry involves the indirect titration of iodine in which iodine is liberated by reaction with…
Step by step
Solved in 3 steps with 3 images
- 3. Analysis of a mixture consisting of NaOH + Na2CO3 + inert matter gives the following data: 10.00 g. Its aqueous solution is diluted to 250.0 mL and two separate 25.00 mL sample portions are titrated. With one portion, an end point with phenolphthalein is obtained in cold solution, with 44.52 mL of 0.5000 N HCI. The other portion requires 46.53 mL of the acid for an end point with methyl orange. Calculate the percentage composition of the original sample.A 0.1093-g sample of impure Na2CO3( Molecular weight 106) was analyzed by the Volhard method. After adding 50.00 mL of 0.06911 M AGN03 (Molecular weight 169.87), the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of the Na2CO3 sample.1. A 1.2-gram sample of lanolin was treated with Wij’s solution and excess potassium iodide solution. The liberated iodine reacted with 30 ml of 0.1 N sodium thiosulfate solution. If the iodine value was determined as 12.69, what is the volume used in blank titration? 2. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value. 3. A 3.50-gram sample of Streptomycin powder was tested for its water content. If the water equivalence factor of the KF reagent was 4.6, what is the percentage water content of the sample if 9.2 ml of the KF reagent was used? 4. A 500mg oil sample is taken from a conical flask and is dissolved in 50mL distilled alcohol. An indicator is added and is then titrated against 0.112N KOH until a slight pink color appears. It took 17.6mL of the titrant to reach the…
- A 25 mL liquid bleach sample is diluted with water to 1000 mL in a bubble gel. 25 mL of the diluted sample is transferred to the flask with a pipette, excess KI is added to it, and thus OCl- ion turns into Cl- ion and I2 is formed. The released iodine is titrated with 0.09892 M Na2S2O3 using the starch reagent, and 8.96 mL is required for the endpoint. Find the % NaOCl (w/v; w/v) in the bleach sample. (Na=23 g/mol, O= 16 g/mol, Cl = 35.44 g/mol) (Warning: solving the necessary reaction equations by writing is necessary to see the stoichiometric relationship) A. 0.132% B. 0.264% C. 5.28% D. 10.56%The Ksp values of two solid carbonates, A2CO3 and BCO3, were determined by preparing 250.0-mL saturated aqueous solutions of both solids and then determining the concentration of carbonate by titrating it with 0.01023 M HCl up to methyl orange endpoint. Solutions of A2CO3 and BCO3 required 6.184 mL and 3.456 mL of the titrant, respectively. a. What are the concentration of carbonate in each of the saturated solutions of A2CO3and BCO3?b. What are the Ksp values of A2CO3 and BCO3? c. If 8.721 mg A2CO3 and 1.769 mg BCO3 were needed to prepare the saturated solutions, what are the identity of A2CO3and BCO3 ?Hint: deduct the molecular weight of carbonated. Instead of distilled water, 250.0 mL of 0.10 M ANO3 was used to prepare a saturatedsolution of A2CO3 while 250.0 mL of 0.10 M B(NO3)2 was used for BCO3. Which will have a higher solubility?A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard Method. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of Na2CO3 sample.
- The ethyl acetate concentration in a alcoholic solution was determined by diluting a 10.00 mL sample to 100.00 mL. A 20.00 mL portion of diluted solution was refluxed with 40.00 mL of 0.04672 M KOH. Ater cooling, the excess OH2 was back-titrated with 3.41 mL of 0.05042 M H2SO4. Calculate the amount of ethyl acetate (88.11 g mol) in the original sample in grams.A 0.1093-g sample of impure Na2CO3 was analyzed by the Volhard Method. After adding 50.00 mL of 0.06911 M AgNO3, the sample was back titrated with 0.05781 M KSCN, requiring 27.36 mL to reach the end point. Report the purity of Na2CO3sample.To determine the fluoride content in an aqueous and chloride-containing preparation of ammonium fluoride, the following analysis was performed. 105.2 mg of the preparation was dissolved in 100.0 mL of water. Then a 300 mL 40 mM lead chloride solution was added, whereby all fluoride ions were precipitated out of the solution in the form of the sparingly soluble salt PbClF (s). The precipitate was separated and washed at 15 degrees with a lead fluoride chloride saturated solution and dried at 130 degrees. The precipitate weighed 651.3 mg. a) Calculate the fluoride content (as % by weight F) in the preparation.b) Determine the purity of the ammonium fluoride preparation
- An unknown 36% v/v monohydroxide reagent has a density of 1.8 g/mL. Zeus wanted to determine the identity of this base, so he transferred a 90.916-mL aliquot of the base to a 1.0 L volumetric flask and diluted it up to mark. He then titrated the base solution and found out that its concentration is 1.0 M.a. What is the molarity of the base solution after dilution? b. If this 1.00M solution is used in the analysis of PLA (Polylactic Acid) plastics for lactic acid (H2Lactate) titration, what is its concentration in titer mg LA/mL titrant? (Lactic Acid: 90.08 g/mol)c. What is the molarity of the unknown monohydroxide reagent?d. What is the molar mass of the unknown monohydroxide reagent?(Density of H2O = 0.99707 g/mL)Hint: Mass of solution = mass of solvent + mass of solutee. What is the identity of the unknown monohydroxide reagent?The solubility of borax, which is made up of sodium tetraborate (Na2B4O5(OH)4 8H2O), was analyzed. The dissolution of borax is: Na2B4O5(OH)4 • 8H2O(s) ⇌ 2 Na+(aq) + B4O5(OH)42–(aq) + 8 H2O(l) A 50 mL saturated solution was prepared. After filtration of solution, 5 mL aliquot was transferred to a flask and titrated using 0.432 M HCl. The endpoint was found to be 4.73 mL of the titrant. Tetraborate anion (B4O5(OH)42-) is a weak base which reacts with HCl like the following reaction: B4O5(OH)42–(aq) + 2 H+(aq) + 3 H2O(l) ⇌ 4 H3BO3(aq) What is Ksp expression for the dissolution? What is the tetraborate ions concentration in the filtrate? What is the molar solubility and Ksp of borax if the titration was done at room temperature (298 K)?The concentration of Cl– in a 300.0-mL sample of water drawn from a fresh water acquifer suffering from encroachment of sea water, was determined by titrating with 0.0516 M Hg(NO3)2. The sample was acidified and titrated to the diphenylcarbazone end point, requiring 6.18 mL of the titrant. Report the concentration of Cl–in parts per million
