Fundamentals Of Analytical Chemistry
9th Edition
ISBN: 9781285640686
Author: Skoog
Publisher: Cengage
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The aluminum in a 1.2 g sample of impure ammonium aluminum sulfate was precipitated with aqueous ammonia. The precipitate was filtered and ignited at 1000 oC to give anhdrous Al2O3, which weighed 0.1798 g. Express the result of this analysis in terms of % NH4Al(SO4)2 and % Al2O3 (Molar mass of Al2O3 =101.96 g/mol, Molar mass of NH4Al(SO4)2= 237.15 g/mol)
Exactly 750.0 mL of a solution that contained 480.4 ppm of Ba(NO3)2 were mixed with 200.0 mL of a solution that was 0.03090 M in Al2(SO4)3.
(a) What mass of solid BaSO4 was formed?
(b) What was the molar concentration of the unreacted reagent [Al2(SO4)3 or Ba(NO3)2]?
2- Calculate the weight of solute in grams for each of the followings solutions.
(a) 43.5 mL of 0.175 N Hg(NO3)2
(b) 10 mL of 0.03 N KI if the reaction product is Agl
(c) 5 litres of 0.25 N K2CO, in acidic medium.
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- Silver ions can be found in some of the city water piped into homes. The average concentration of silver ions in city water is 0.028 ppm. (a) How many milligrams of silver ions would you ingest daily if you drank eight glasses (eight oz/glass) of city water daily? (b) How many liters of city water are required to recover 1.00 g of silver chemically?arrow_forwardThe Handbook of Chemistry and Physics (http://openstaxcollege.org/l/16Handbook) gives solubilities of the following compounds in grams per 100 mL of water. Because these compounds are only slightly soluble, assume that the volume does not change on dissolution and calculate the solubility product for each. (a) BaSiF6, 0.026 g/100 mL (contains SiF62- ions) (b) Ce(IO3)4, 1.5102 g/100 mL (c) Gd2(SO4)3, 3.98 g/100 mL (d) (NH4)2PtBr6, 0.59 g/100 mL (contains PtBr62- ions)arrow_forwardAccording to the Resource Conservation and Recovery Act (RCRA), waste material is classified as toxic and must be handled as hazardous if the lead concentration exceeds 5 mg/L. By adding chloride ion, the lead ion will precipitate as PbCl2, which can be separated from the liquid portion. Once the lead has been removed, the rest of the waste can be sent to a conventional waste treatment facility. How many grams of sodium chloride must be added to 500 L of a waste solution to reduce the concentration of the Pb2+ ion from 10 to 5 mg/L?arrow_forward
- Calculate the molarity of AgNO3 in a solution prepared by dissolving 1.44 g AgNO3 in enough water to form 1.00 L solution.arrow_forwardCalculate the solubility in grams per 100 mL of BaF2 in a 0.10 M BaCl2 solution.arrow_forwardLead poisoning has been a hazard for centuries. Some scholars believe that the decline of the Roman Empire can be traced, in part, to high levels of lead in water from containers and pipes, and from wine that was stored in leadglazed containers. If we presume that the typical Roman water supply was saturated with lead carbonate, PbCO3 (Ksp = 7.4 1014), how much lead will a Roman ingest in a year if he or she drinks 1 L/day from the container?arrow_forward
- 68. Aluminum ion may be precipitated from aqueous solution by addition of hydroxide ion, forming Al(OH)3. A large excess of hydroxide ion must not be added, however, because the precipitate of Al(OH)3 will redissolve as a soluble compound containing aluminum ions and hydroxide ions begins to form. How many grains of solid NaOH should be added to 10.0 mL of 0.250 M A1Cl3 to just precipitate all the aluminum?arrow_forwardA chemist dissolves a 1.497-g sample of a type of metal (an alloy of Sn, Pb, Sb, and Cu) in nitric acid, and metastannic acid, H2SnO3, is precipitated. She heats the precipitate to drive off the water, which leaves 0.4909 g of tin(IV) oxide. What was the percentage of [in in the original sample?arrow_forwardBe sure to answer all parts. Industrially, vanadium metal, which is used in steel alloys, can be obtained by reacting vanadium(V) oside with calcium at high temperatures: SCa• V;0g- SCao+ 2V In one process, 1.540 x 10'gof V;O; reat with 2.090 x 1eg Ca. (a) Calculate the theoretical yield of V. (b) Calculate the percent yield if 805.0 g of V are obtained. Report your answers to the correct number of significant figures.arrow_forward
- please help me The aluminum in a 1.200g sample of impure ammonium aluminum sulfate was precipitatedwith aqueous ammonia as the hydrous Al2O3 · XH2O. The precipitate was filtered and ignitedat 100°C to give anhydrous Al2O3, which weighed 0.2001 g. Express the result of this analysisin terms of % Al.arrow_forwardA student uses 7.500 grams of oxalic acid (H₂C₂O₄) to make 250.0 cm³ of solution in a volumetric flask. She then transfers 20.0 cm³ of the solution to a conical flask with a pipette. What is the concentration in mol·dm⁻³ of the oxalic in the conical flask?arrow_forwardGold is isolated from rocks by reaction with aqueouscyanide, CN-: 4 Au(s) + 8 NaCN(aq) + O2(g) + H2O(l)-------->4 Na[Au(CN)2](aq) + 4 NaOH(aq). (a) Which atoms fromwhich compounds are being oxidized, and which atomsfrom which compounds are being reduced? (b) The[Au(CN)2]- ion can be converted back to Au(0) by reactionwith Zn(s) powder. Write a balanced chemical equationfor this reaction. (c) How many liters of a 0.200 M sodiumcyanide solution would be needed to react with 40.0 kg ofrocks that contain 2.00% by mass of gold?arrow_forward
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