Recent questions in Chemistry

+1 vote

1 answer 59 views

Using mass spectrometry, identify the unknown compound X given the following key mass spectral data: molecular ion peak at m/z 112, base peak at m/z 91, and characteristic fragment peaks at m/z 73 and m/z 57. Provide a molecular structure proposal for compound X based on the mass spectral data.

asked Jan 30 in Analytical Chemistry by KathyRoten08 (360 points)

–1 vote

1 answer 72 views

Using mass spectrometry, analyze and identify the unknown compound given to you by comparing its mass spectrum with the known compounds in the database. What is the molecular weight and functional group of the unknown compound?

asked Jan 30 in Analytical Chemistry by DonteBladen8 (440 points)

+1 vote

1 answer 79 views

Using liquid chromatography techniques, determine the concentration of caffeine in a given sample of coffee and compare it with the recommended safe limit for human consumption.

asked Jan 30 in Analytical Chemistry by RhysConrad91 (340 points)

+1 vote

1 answer 60 views

Using infrared spectroscopy, identify the functional groups present in a given compound and explain their characteristic peaks in the spectrum.

asked Jan 30 in Analytical Chemistry by SammieLzn423 (280 points)

+1 vote

1 answer 82 views

Using infrared spectroscopy, characterize the functional groups present in a compound labeled as unknown X. Compare the IR spectrum of unknown X with the spectra of known compounds and identify the functional groups present in unknown X.

asked Jan 30 in Analytical Chemistry by AngusSeals8 (370 points)

0 votes

1 answer 50 views

Using an ion-selective electrode, a student measures the concentration of chloride ions in a solution as 0.20 M. The solution also contains either nitrate or sulfate ions. How can the student determine which ion(s) is present in the solution and calculate their concentration?

asked Jan 30 in Analytical Chemistry by EliseLink178 (410 points)

0 votes

1 answer 57 views

The question for the chemistry student to solve is: What is the percentage composition of the minerals present in a rock sample using X-ray diffraction technique?

asked Jan 30 in Analytical Chemistry by StephanApoda (370 points)

0 votes

1 answer 75 views

The problem for the student to solve could be: Using Nuclear Magnetic Resonance (NMR) spectroscopy, determine the molecular structure and functional group(s) present in an unknown organic compound with a molecular formula of C4H8O2.

asked Jan 30 in Analytical Chemistry by BillyNgo3442 (470 points)

0 votes

1 answer 78 views

The problem can be stated as follows: A mixture of three solvents, A, B, and C, is provided. The composition of the mixture is unknown but it is suspected that solvent C is present only in small quantities. Using gas chromatography, how can you determine the relative amounts of each solvent in the mixture and confirm the presence of solvent C in the mixture?

asked Jan 30 in Analytical Chemistry by JeroldMattha (370 points)

0 votes

1 answer 74 views

Suppose you are given a sample containing an unknown concentration of copper ions. Using colorimetry, how would you determine the concentration of copper ions in the sample? Provide a step-by-step procedure and explain the principles behind each step.

asked Jan 30 in Analytical Chemistry by JacelynMcGir (490 points)

0 votes

1 answer 61 views

Question: A student wants to quantify the amount of iron (Fe) in a water sample using coulometry. The sample has a mass of 50.0 g and contains iron in the form of Fe(II) ions. The student sets up the electrochemical cell and begins the oxidation reaction, which requires a current of 16.0 A for 1200 s. What is the concentration of Fe(II) ions in the water sample in mol/L?

asked Jan 30 in Analytical Chemistry by IvyHaddock2 (290 points)

0 votes

1 answer 75 views

Question: A chemistry student wants to determine the concentration of copper (II) ions in a water sample. The student has access to a UV-Vis spectrophotometer and a copper (II) sulfate standard solution. Outline the steps the student should take to quantify the concentration of copper (II) ions in the water.

asked Jan 30 in Analytical Chemistry by HelenStidham (290 points)

0 votes

1 answer 76 views

One precise problem for the chemistry student to solve could be: Using colorimetry, determine the concentration of iron (II) ions in a given sample of water and compare your results with the acceptable limit set by the Environmental Protection Agency.

asked Jan 30 in Analytical Chemistry by PriscillaGat (430 points)

0 votes

1 answer 90 views

Investigate the concentrations of copper ions in a given sample of drinking water using voltammetry and determine the accuracy of the measurement technique by comparing it with other analytical methods.

asked Jan 30 in Analytical Chemistry by DonThorton4 (400 points)

0 votes

1 answer 87 views

In an experiment, a student identified an unknown organic compound using mass spectrometry analysis. The mass spectrum showed an M+ peak at m/z 86 and a base peak at m/z 43. Using this information, can you determine the molecular formula of the unknown compound?

asked Jan 30 in Analytical Chemistry by JerryStLeon8 (270 points)

0 votes

1 answer 78 views

Identify the unknown compound X using mass spectrometry. The compound has a molecular formula of C8H10O2 and a mass spectrum with a molecular ion peak at m/z 150 and base peak at m/z 77. Provide the structural formula of the compound and explain the fragmentation pattern observed in the mass spectrum.

asked Jan 30 in Analytical Chemistry by AldaBartos98 (190 points)

0 votes

1 answer 55 views

Identify the unknown compound X using mass spectrometry data provided. The data includes the molecular ion peak at m/z 172, and fragment ions at m/z 145 and 127.

asked Jan 30 in Analytical Chemistry by Rex78H23943 (450 points)

0 votes

1 answer 88 views

Identify the unknown compound X using mass spectrometry data given below. The molecular ion peak of X is observed at m/z 120 with a relative intensity of 100%. Additionally, the following fragment peaks with their respective relative intensities were also observed: m/z 105 (40%), m/z 92 (15%), m/z 77 (10%), and m/z 65 (5%). What is the molecular formula of X and what is its structural formula?

asked Jan 30 in Analytical Chemistry by ZacheryWilli (310 points)

0 votes

1 answer 71 views

Identify the unknown compound using mass spectrometry for a sample that has a molecular ion peak of m/z 167 and fragmentation peaks of m/z 150, 135, 77 and 49.

asked Jan 30 in Analytical Chemistry by MelvinBath2 (310 points)

0 votes

1 answer 59 views

Identify the unknown compound obtained from a mixture of three compounds using mass spectrometry. Provide the molecular formula and structural formula for the unknown compound.

asked Jan 30 in Analytical Chemistry by RebekahHhd81 (370 points)

Categories