. If an unknown forms a silver mirror in the Tollens test, forms a purple color in the Schiff test, produces no precipitate in the iodoform test, has a refractive index of 1.5250, and forms a semicarbazone melting at 124-126°C, what is its identity? Support your conclusions.

. If an unknown forms a silver mirror in the Tollens test, forms a purple color in the Schiff test, produces no precipitate in the iodoform test, has a refractive index of 1.5250, and forms a semicarbazone melting at 124-126°C, what is its identity? Support your conclusions.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter28: Atomic Spectroscopy

Section: Chapter Questions

Problem 28.12QAP

See similar textbooks

Related questions

Q: 3. How does steam facilitate the distillation of essential oils? 4. Discuss some applications of…

A: 3. Steam distillation is very common method to extract essential oils. During the process the steam…

Q: Given your choice of Flame AA, ICP-AE, XRF, EI-MS, or none of these, and keeping in mind that cost…

A: The function of Flame AA is to detects the metal present in a sample. The function of ICP-AE is to…

Q: Please enumerate and explain 1. WHAT ARE THE GENERAL RULES IN GRAMS STAINING CLASSIFICATION OF…

A: In microbiology, Gram staining is the most widely utilised, vital, and widely used differential…

Q: For this statement, answer True or False and explain your answer briefly. Polarity is the only…

A: In liquid-liquid extraction, a non-polar substance present in an aqueous solution is extracted by…

Q: What does it mean when a substance has low molar absorptivity? The substance has low transmittance.…

A: Molar Absortivity means how strongly a chemical species absorbs light at particular wavelength that…

Q: The amino acid cysteine typically gives two spots in TLC. Explain why this is so.

A: As amino acids are colourless ,to see the spots in chromatogram we apply a solution of ninhydrin to…

Q: Which statement is true? Statement 1: In a paper chromatography that uses a cellulose-based…

A: Given : Two statements are given To find : True statements Solution : Chromatography is a…

Q: Consider the following three compounds: a. Which compound do you predict should be the most soluble…

A: We know that like dissolves like means polar solute dissolve in polar solvent whereas nonpolar…

Q: Once all the unsuitable colours are removed, the company claims that its sweets are now free from…

Q: Why should solid diazonium salts never be separated from their mother liquor by filtration?

A: Why solid diazonium salts never be separated from their mother liquor by filtration - Let's discuss.

Q: In the preparation of a standard stock solution for protein analysis, 50 mg of bovine serum albumin…

Q: Which of the following would LOWER the purity of the distillate collected from the rubbing alcohol…

Q: 1: What is the molar concentration of a 4% solution of borax? (sodium tetraborate decahydrate,…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: The compounds you are separating are; Cholesterol/cholesterol acetate on a silica gel the solvent is…

A: Thin-layered chromatography or gas chromatography system employed which allows a complete separation…

Q: Compound X was dissolved in a 5-mL volumetric flask. A 1.00-mL aliquot of the compound was placed in…

A: Given, Absorbance = 0.427 Cuvette length = 1.00 cm Molar absorptivity = 6130 M-1 cm-1 Molecular…

Q: Describe the five processes of purifying organic compounds and give one example for each.…

A: Various methods are used for the purification of organic compounds.

Q: Tell whether each statement below is true or false, and explain your answer in not more than five…

A: (a) Answer - True the process of separation in chromatography is more selective than UV - visible…

Q: Give 3 examples for inorganic binders and write their approximate calcination temperatures.

A: A question based on inorganic binders, which is to be accomplished.

Q: Describe the procedure you would follow in removing the lower and the upper layers from a separatory…

A: A question based on purification, which is to be accomplished.

Q: What kind of sample cleanup does solid-phase extraction accomplish in the analysis of caffeine and…

A: Introduction: Extraction is the process of separation of the molecules. There are two types of…

Q: Using the following choices, determine which will result in a brightly and dimly lit light bulb…

Q: Which method would be most appropriate for the purification of an off-color crystalline compound? A.…

A: Introduction: Purification is the process of obtaining pure compounds by removing unwanted…

Q: 3420 IR Spectrum (liquid film) 1742 4000 3000 2000 1600 1200 800 v (cm")

A: Degree of unsaturation of compound is 1.So there is possibility of 1 double bond or 1 ring . There…

Q: What is done if the solid contains a colored impurity?  Know the proper funnels and equipment to…

A: The procedure is about purification through recrystallization process.

Q: In your job as a chemist for a regional analytical laboratory, you are expecting many samples that…

Q: Isopropanol is a good extraction solvent for plant pigments as it breaks down cell walls and is…

A: Spinach leaves has few more pigments other than chlorophyll-a, that are carotenes, chlorophyll-b and…

Q: Explain the difference between absorption and adsorption in natural dyes. Use sketches to clarify…

A: Please find your solution below : Absorption is the process in which absorbed material is uniformly…

Q: Lab analysis indicates that a water sample contains 0.3 mM Ca2+, 10-3.5 atm pCO2, and [H+] = 10-7 M.…

A: The extent of a substance dissolved in a provided volume of a solvent is expressed as dissolution.…

Q: If an unknown forms a silver mirror in the Tollens test, forms a purple color in the Schiff test,…

Q: Question 9 Which one of the following statements is FALSE? In a TLC experiment with amino acids, if…

Q: Propose how the components of a mixture containing Toluene (b.pt= 110.50C) and CCl4 (b.pt. =770C)…

A: The mixture containing the two toluene and CCl4 can be easily separated by the method of fractional…

Q: 1. You know that these types of compounds can be analyzed by either GC or HPLC but you are told by…

A: GC can only apply to analyse volatile substance while HPLC can handle any soluble compound…

Q: Given the following concentrations of aqueous ions as well as their atomic weight or molecular…

Q: What happens if the solvent concentration falls below that of the silica stationary phase? What is…

A: The chromatography technique consists of two phases mobile and stationary phase .Mobile phase is the…

Q: Compound X was dissolved in a 5-mL volumetric flask. A 1.00-mL aliquot of the compound was placed in…

A: It is application of dilution Law and Lambert Beer Law Here we are required to find the mass of…

Q: Which of the ff. wavelengths will avoid the problem of colored samples during turbidity…

A: Answer Wavelength will avoid the problem of coloured sample…

Q: What is Solubility of phenazopyridine in water?acidic media? basic media ?and what is most common…

A: The ability of a substance to mix with another substance to form a homogeneous mixture is called its…

Q: Why should we develop different methods for the separation of chiral compounds in pharmaceutical…

A: Chiral pharmaceutical Compounds have many chiral centers which can interact differently with the…

Q: Complete the blanks in the sentences given below with appropriate expressions. ………………………. Is a…

A: Given statements: ………………………. Is a separation and purification technique consisting of a solid phase…

Q: Based on the structures of the compounds above, write the letter symbol of the spot corresponding to…

A: The crude reaction mixture has two or more reactions combined in a different molar ratio. Generally,…

Q: Which of the following would LOWER the purity of the distillate collected from the rubbing alcohol…

A: General chemistry

Q: Briefly explain the principle behind the following techniques: (a) ion-exchange chromatography (b)…

A: Question is based on chromatography techniques:

Q: Explain the major differences in macromolecular structural analysis using crystallography or cryo…

A: Techniques of structural analysis

Q: Under the conditions of this extractive procedure, how does aspirin become partitioned into the…

A: The reactivity of carboxylic group in the aspirin determines the total extraction. The acidic…

Q: a. The structure of a standard C4 group chemically bonded to a silica surface through a silyl ether…

A: SOLUTION: Step 1: The most commonly used column in silica based reverse stationary phase is…

Q: More polar molecules move more slowly through silica than less polar molecules. Why is silica gel…

A: In methyl orange is polar since it contains the ionic part of the molecule (SO3-Na+). However, in…

Q: CSH9N .4 2114 3295 IR Spectrum (liquid film) 1200 2000 1600 V (cm' ) 4000 3000 800

Q: Is it possible to prepare a 17% dye solution from a 4% dye solution? Explain.

A: If the solution is too weak in terms of concentration, we can evaporate some of the solvent to make…

Question

100%

eirli ri boeu 2s9dut tesi ari neolb of onot 2u of ton insiioqmi ti ei vrlW
6. If an unknown forms a silver mirror in the Tollens test, forms a purple color
in the Schiff test, produces no precipitate in the iodoform test, has a refractive
index of 1.5250, and forms a semicarbazone melting at 124–126 °C, what is its
identity? Support your conclusions.
Satsoilqid ni elest evitstilsup orli miohsq of inshoqrai ti ai ydW .E
ISBN O-87540-728
© 1999 by Chemical Education Resoure

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

This is a popular solution!

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Trending now

This is a popular solution!

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

R 400m N CO₂tBu OH CO₂Me Ph LDA THF, -78 °C silica gel 6 days room temperature R MeO₂C NCO₂Bu CHO CO,Me I + H₂O
Zine oxide ointment contains 159 of zhe oxide mixed with 85gof simple ointment. you repuine on ointment with 13% zine axide. ß huow would you need to add to 220g How momy g of simfle ointment of zine oxide ointment APF to ointment containing 18% make a चाट वरादe
A student measures k for a certain blue dye to be 600.4 M-¹ at 560 nm. What is the molarity of the dye in a solution with an absorbance of 0.204 at this wavelength? Ens nousior #inslo: Monia sin 8 foi 00.01 Par det id elsem. sow & netimuloa 51 (5) sonos silf et trawIm 00 001 et gauzulib im
Calaculate the initial concentration of [Fe3+] and [SCN-] of a solution with 5 mL of 0.002 M Fe(NO3)3, 2 mL of 0.002 M KSCN, 3 mL of water, and an absorbance of 0.221.
2. One of the common methods used to determine phosphorus in urine isto treat urine with molybdenum(VI) resulting in a complex compoundof 12- molybdophosphate and then reduced using ascorbic acid produces a blue-colored compound called molybdenum blue (max = 650 nm). A patient's urine sample collected over 24 hours produced 1122 mL of urine. A total of 1 mL of the sample was treated with Mo(VI) and ascorbic acid and diluted until it reached a volume of 50 mL. A calibration curve is also prepared by treating 1 mL of standard phosphate solution in the same way. The absorbance of the standard solution and the sample was then measured at a wavelength of 650 nm and produced the following data: Solution Absorbance at λ 650 nm Phosphate 1 ppm Phosphate 2 ppm Phosphate 3 ppm Phosphate 4 ppm Urine sample 0,230 0.436 0,638 0,848 0.518 a. Create a calibration curve for the data and determine the slope, intercept, and R values of 2! Determine the concentration of phosphates found in urine samples…
20. In current-sampled polarography the polarographic wave of which metal ion will appear first? Pb (E% = -0.4 V) Cd (E% - -0.6 V) O Zn (E% = -1.0 V) Cu (E% - +0.02 V)
At 580 nm, which is the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00 I03L cm-1 mol-1.Calculate (a) the absorbance of a 4.47 10-5 M solution of the complex at 580 nm in a 1.00-cm cell. (b) the absorbance of a solution in a 2.50-cm cell in which the concentration of the complex is one half that in(a). (c) the percent transmittance of the solutions described in (a) and (b). (d) the absorbance of a solution that has half the transmittance of that described in (a).
g 2.png Average absorbance, .129 +0.128 +0.127)/3 = 0.128 Chrome Concentration of Females of Fe volume Q Molarity of Fe(NO₂)) = 0.2M Volume of Fe(NO₂)); = 5.00mL Moles of Fe³+= Molarity x Molarity x volume(L) Moles of Fe³* = 0.2M x 0.0054 = 10³mole 10-mole 500 x 10-3=0.002M [Fe³+] = [SCN¯] = X = ✪ [Fe³] = 0.002mol/L nknown concentrations to determine [FeSCN]at equilibrium in solution 8: Y = 4290X - 0.068 72% (0.127 + 0.068) 4290 0.127=4290X - 0.068 25ml Fe³+ x 0.002 mol/L-¹ 100mL 100% = 4.5 x 10-5mol/L 20ml SCN X 0.002 mol/L-¹ 100mL = 5.00 x 10^4 mol/L^-1 = 4.00 x 10 mol/L-1 W Flask 8 Flask 9 Flask 10 Flask 11 3.png 4.png Part 3: Q8 Flask 8 Flask 9 Flask 10 Flask 11 Part 3: 09 Flask 8 Flask 9 Flask 10 Flask 11 [Fe³+ (mol/L) 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 5.00 x 10-4 Average absorbance 0.127 0.166 0.222 69% 0.308 100% [FESCN¹ (mol/L) 4.5 x 10- 5.4 x 10 6.76 x 10-5 8.76 x 10- [SCN (mol/L) 4.00 x 10-4 4 x 10-4 7 x 10-4 1x 10-³ 3 7.png Place the results from calculations 9 and 10 into…
а. Cr (aq) + Cl; (9) — Сr207? (ад) + CI (аq) V b. Ni2+ (aq) + Ca(s) — Са* (аg) + Ni(s) V
what is the thore tical yield of vanadium that can be produced y the reaction of 40.09 of V 205 with 40.0s of calcium based on the followin) chemiAl reacton V 205 CS) +5 Cal ) 2Va) +S CaD cS) 6-) 1.23 bi) 22ug c)stg d.) 40.05 e) 20:35
4. A solution containing complexes of Bi (III) and thiourea has a molar absorptivity of 9.32 x 103 L/cm.M at 470 nm. Calculate the absorbance of a 6.24 x 10-5 M solution in a 1.00 cm cell. 58.15 x 10-2 5.815 x 109 1.494 x 108 O 5.815 x 10-7
A standard iron solution was prepared by dissolving 0.0140 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.214 in a 1.00 cm cuvette. A 0.128 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to the mark with water. A 1.00 mL aliquot of the sample was transferred to a 25.00 mL volumetric flask, and diluted to the mark with water. A portion of the diluted sample was then transferred to a 1.00 cm cuvette and measured at a wavelength of 540 nm. The resulting absorbance was 0.216. Determine the % w/w of Fe in the iron ore.