Recent questions in Chemistry

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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 DexterTejada (1.7k points)

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1 answer 73 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 JewelFison69 (1.8k points)

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1 answer 81 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 Vern5918460 (2.5k points)

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1 answer 121 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 LeeAlder0448 (1.5k points)

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1 answer 91 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 AWSReginald (2.2k points)

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1 answer 69 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 CalebHartman (2.0k points)

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1 answer 98 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 AddieFrayne (1.7k points)

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1 answer 94 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 GFXFlorida24 (1.5k points)

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1 answer 109 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 LindseyMorga (2.2k points)

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1 answer 106 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 MaxwellDuff3 (1.9k points)

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1 answer 100 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 MargueriteSa (2.1k points)

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1 answer 60 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 Makayla14235 (2.3k points)

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1 answer 105 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 MarielScully (1.4k points)

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1 answer 96 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 NicholasPedi (1.8k points)

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1 answer 65 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 SherrillDail (1.6k points)

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1 answer 64 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 Jan 30 in Analytical Chemistry by MeganAndrzej (2.0k points)

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1 answer 120 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 Jan 30 in Analytical Chemistry by KarolinBalse (1.5k points)

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1 answer 78 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 Jan 30 in Analytical Chemistry by LouellaComo (1.5k points)

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1 answer 88 views

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

asked Jan 30 in Analytical Chemistry by GustavoPonti (1.6k points)

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1 answer 103 views

Identify the functional groups present in an unknown organic compound using infrared spectroscopy and explain their characteristic peak frequencies.

asked Jan 30 in Analytical Chemistry by HazelMcCaule (1.5k points)

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