Q 18 and Q19 And Q20 please 15. Capillary columns are open tubular columns constructed from which ofthe following materials?a) Glassb) Metalc) Stainless steeld) Fused silica16. The Calcium Ca2 (40.08 g/mol) in a 200 ml sample was precipitatedand ignited to give CaO (56.08 g/mol) a weight of 0.1132 g Calculatethe mass of Ca/100 ml?a) 40.38b) 0,040c) 46.04d) 33.3217. The difference between the experimental value and the true value iscalled:a) relative error b) precision c) accuracy d) absolute error18.A 500 ml of water sample is found to contain 0.0014 g of CaCO (M Wt100 g/mol). Calculate the concentration of CaCO, in parts per million(ppm).a) 2.80b) 1.4 x 10²c) 5.60d) 1.4019. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm.Calculate the absorbance of this solutiona) 191.1b) 0.439c) 273x10d) 32 x 1020. Calculate the molar absorbtivity of the above KMnO, solution:a) 584 cm'mol Lb) 585 x 10 cmmor Lc) 25.48 x 10 cm'mol Ld) 1.87 x 10 cm mot21. In Gas-liquid phase chromatography, the stationary phase is composedand the mobile phase is made ofofa Solid liquidb)Liquid liquidc)Liquid gasd) Solid, gas

Answered: Image /qna-images/answer/26968948-62da-4268-8550-dd7a45b8f46b.jpg

18.A 500 ml of water sample is found to contain 0.0014 g of CaCOs (MW 100 g/mol). Calculate the concentration of CaCO, in parts per million (ppm) a) 2.80 b) 1.4 x 10² c) 5.60 d) 1.40 19. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of 36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm Calculate the absorbance of this solution b) 0.439 a) 191.1 c)273x10 d) 32x 10 20. Calculate the molar absorbtivity of the above KMnO, solution b) 5.85 x 10 cm mor d) 1.87 x 10 cm mot a) 564 cm'mol L c) 25.48 x 10 cm'mol L

18.A 500 ml of water sample is found to contain 0.0014 g of CaCOs (MW 100 g/mol). Calculate the concentration of CaCO, in parts per million (ppm) a) 2.80 b) 1.4 x 10² c) 5.60 d) 1.40 19. Given a 7.50 x 10 M solution of KMnO, that has a transmittance of 36.4% when measured in a 1.0 cm cell at a wavelength of 525 nm Calculate the absorbance of this solution b) 0.439 a) 191.1 c)273x10 d) 32x 10 20. Calculate the molar absorbtivity of the above KMnO, solution b) 5.85 x 10 cm mor d) 1.87 x 10 cm mot a) 564 cm'mol L c) 25.48 x 10 cm'mol L

Chemistry by OpenStax (2015-05-04)

1st Edition

ISBN:9781938168390

Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Chapter18: Representative Metals, Metalloids, And Nonmetals

Section: Chapter Questions

Problem 115E: A mixture of xenon and ?uorine was heated. A sample of the white solid that formed reacted with...

See similar textbooks

Similar questions

To each digestion flask 200 mL aliquots of 10 different drinking water samples were added. Silver was extracted by a co-precipitation procedure and collected by filtration. The precipitate was digested in 200 μl hot concentrated nitric acid and diluted to 5 mL in a dilute phosphate solution. Standards were prepared according to the following table. The samples were analyzed by graphite furnace AAS. Calculate the concentration of silver in each sample. Are there any problems? How will you address each of the identified problems?
The mass of K3PO4 needed to prepare 250.0mL of an aqueous solution in which PO4-3 concentration is 0.0550M. The answer is ……………………… How many grams of silver sample is equal to 0.0417 mole of silver The answer is ……………………… When 38.0 mL of 0.1250 M H2SO4 is added to 100 mL of a solution of PbI2, a precipitate of PbSO4 forms. The PbSO4 is then filtered from the solution, dried, and weighed. If the recovered PbSO4 is found to have a mass of 0.0471g, what was the concentration of iodide ions in the original solution The answer is ……………………………… Express 96.342 m using 2 significant figures The answer is ………………………………. The oxidation number of sulfur in (Na2S2O5) is? The answer is ………………………………
What mass (in grams) of Na2S2O3 is needed to dissolve 0.44 g of AgBr in a solution volume of 1.0 L, given that Ksp for AgBr is 3.3×10−13 and Kf for [Ag(S2O3)2]3− is 4.7×1013?
1,5419 g of magnetite (Fe3O4) ore; Fe+2 and Fe + 3 in concentrated HCL to form a mixtureit's unraveling. Adding HNO3 to all Fe +2s Fe +3 e and Fe+3 s NH, addingwith Fe(OH)3, precipitating into. Sediment in the form of Fe3O4 after necessary operationsand 0.8525 g. Calculate the percentage of Fe3O4 in the sample.
A technician is setting up a laboratory to standardise ~0.0200 mol dm–3 KMnO4. What mass of Mohr’s salt [FeSO4(NH4)2SO4·6H2O] would the technician be required to weigh out to produce a 5.00 L solution of Mohr’s salt such that 25.0 cm3 aliquots of the salt would require a titre of 20.0 cm3 to standardise the KMnO4 solution?
A newly-discovered iron ore was examined to determine percent iron in the ore gravimetrically. 5.408 grams of the ore samples was subjected to gravimetric analysis and precipitated as iron (III) oxide and dried at 105 degrees Celsius. What is the percent iron contentn of the ore if the mass of the precipitate is 0.3785 grams?
A 1.1324 g sample of magnetite ore was dissolved in concentrated HCl to give a solution that contained a mixture of Fe2+ and Fe3+. Nitric acid was added and the solution was boiled for a few minutes, which converted all of the iron to Fe3+. The Fe3+ was then precipitated as Fe2O3*xH2O by addition of NH3. After filtration and washing, the residue was ignited at a high temp to give 0.5394 g of pure Fe2O3. What is the percent Fe and the percent Fe3O4 in the sample?
Suppose you wanted to analyze the amount of metal in the alloy. For example, you might want to determine the nickel (Ni2+) content in alloy material. (a) Suppose the nickel had been precipitated from the alloy (2.0980g) using dimethylglyoxime (H2DMG) as an organic precipitating agent and giving a precipitate of complex nickel dimethylglyoxime (Ni(HDGMG)2) weighing 0.2370g. Calculate the percentage weight of nickel (Ni2+) in the alloy sample.
A solution was prepared by dissolving 1210 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 775 mL. Calculate: the molar analytical concentration of K3Fe(CN)6. the weight/volume percentage of K3Fe(CN)6. ppm Fe(CN)6
A sample known to consist of NaOH orNaHCO3, or Na2CO3 or possible compatible mixtures of these, together with inert matter. With methyl orange, a 1.10 g sample requires 31.40 mL of HCl (of which 1.00 mL ≈ 0.0140 g CaO). With phenolphthalein, the same weight of sample requires 13.30 mL of the acid. Calculate the percentage of inert matter in the sample.
The gravimetric analysis of a 11.432-gram sample of silver ore yields 4.918 grams of silver iodide [MW=234.77 g/mole]. Determine the percent by weight of silver metal [At.Wt. = 107.868 g/mole] in the ore.
In determining the manganese dioxide content of a pyrolusite mineral. A sample of 0.5261 g of pyrolusite was treated with 0.7149 g of 97.98% sodium oxalate in an acid medium. After the reaction was complete, 30.47 mL of a 0.02160 M potassium permanganate solution was required to titrate for excess unreacted oxalic acid. Calculate the percentage of manganese dioxide in the pyrolusite.

SEE MORE QUESTIONS

Recommended textbooks for you

Chemistry by OpenStax (2015-05-04)

Chemistry

ISBN:

9781938168390

Author:

Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:

OpenStax

General Chemistry - Standalone book (MindTap Cour…

Chemistry

ISBN:

9781305580343

Author:

Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:

Cengage Learning

Fundamentals Of Analytical Chemistry

Chemistry

ISBN:

9781285640686

Author:

Skoog

Publisher:

Cengage

Chemistry by OpenStax (2015-05-04)

Chemistry

ISBN:

9781938168390

Author:

Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser

Publisher:

OpenStax

General Chemistry - Standalone book (MindTap Cour…

Chemistry

ISBN:

9781305580343

Author:

Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell

Publisher:

Cengage Learning

Fundamentals Of Analytical Chemistry

Chemistry

ISBN:

9781285640686

Author:

Skoog

Publisher:

Cengage

SEE MORE TEXTBOOKS