Recent questions in Analytical Chemistry

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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 6 days ago in Analytical Chemistry by DebbraP5909 (510 points)

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1 answer 46 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 6 days ago in Analytical Chemistry by Raphael64O24 (690 points)

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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 6 days ago in Analytical Chemistry by EleanoreVela (570 points)

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1 answer 54 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 6 days ago in Analytical Chemistry by TrenaBecher4 (590 points)

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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 6 days ago in Analytical Chemistry by AbigailValen (370 points)

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1 answer 61 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 6 days ago in Analytical Chemistry by DomingoMarce (750 points)

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1 answer 51 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 6 days ago in Analytical Chemistry by RussTaverner (490 points)

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1 answer 65 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 6 days ago in Analytical Chemistry by SantoQuinton (430 points)

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1 answer 71 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 6 days ago in Analytical Chemistry by WUYSven69745 (390 points)

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1 answer 73 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 6 days ago in Analytical Chemistry by DonnellDewee (590 points)

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1 answer 72 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 6 days ago in Analytical Chemistry by RobbiePartee (550 points)

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1 answer 67 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 6 days ago in Analytical Chemistry by ZandraClemmo (830 points)

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1 answer 46 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 6 days ago in Analytical Chemistry by BeatriceBerm (570 points)

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1 answer 69 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 6 days ago in Analytical Chemistry by Trudy12Q9255 (490 points)

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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 6 days ago in Analytical Chemistry by BonnieEdens (370 points)

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1 answer 49 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 6 days ago in Analytical Chemistry by SofiaCarandi (650 points)

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1 answer 46 views

Identify the unknown compound in a given sample using mass spectrometry and provide its chemical formula, molecular weight, and possible functional groups present in the compound.

asked 6 days ago in Analytical Chemistry by RichHeredia3 (490 points)

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1 answer 83 views

Identify the structure of an unknown organic compound using nuclear magnetic resonance spectroscopy, given the following NMR spectrum and molecular formula (C7H14O2): Chemical shift (ppm) Integration0.87 — 3H (s)1.25 — 3H (s)1.45 — 2H (m)2.10 — 2H (t)2.80 — 1H (br s)4.00 — 1H (t)4.20 — 1H (br s)9.70 — 1H (s)

asked 6 days ago in Analytical Chemistry by CatherineLan (490 points)

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1 answer 52 views

Identify the structure of an unknown compound with a mass-to-charge ratio (m/z) of 112 using mass spectrometry. What is the molecular formula of the compound based on the information obtained from the mass spectrum?

asked 6 days ago in Analytical Chemistry by EveretteLcr6 (710 points)

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1 answer 62 views

Identify the structure of an unknown compound (C10H12O2) using nuclear magnetic resonance spectroscopy.

asked 6 days ago in Analytical Chemistry by JesusJ93482 (670 points)

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