Recent questions in Analytical Chemistry

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1 answer 53 views

How can capillary electrophoresis be used to accurately determine the concentration of different ions in a given sample?

asked Jan 29 in Analytical Chemistry by MarcelaJdb78 (270 points)

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1 answer 48 views

How can capillary electrophoresis (CE) be used to determine the quantity of specific ions or molecules in a sample, and what are the factors that could affect the accuracy and reproducibility of the CE analysis results?

asked Jan 29 in Analytical Chemistry by TeresitaJack (450 points)

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1 answer 51 views

How can atomic absorption spectroscopy be used to quantitatively determine the concentration of lead (Pb) in a water sample taken from a local river? What steps must be taken to prepare the sample and calibrate the spectroscopic instrument? How can the results be verified and reported?

asked Jan 29 in Analytical Chemistry by EmilPeeples5 (510 points)

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1 answer 58 views

How accurately can we determine the purity of a given sample of a substance using melting point determination and what are the possible sources of error in this process?

asked Jan 29 in Analytical Chemistry by TomasV603633 (340 points)

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1 answer 54 views

Given the molecular formula and NMR spectrum of an unknown compound, can you identify the structure of the compound using nuclear magnetic resonance spectroscopy?

asked Jan 29 in Analytical Chemistry by JonahFairban (350 points)

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1 answer 49 views

Given an unknown compound, how can one identify its molecular formula and structural information using mass spectrometry? Provide a step-by-step guide on how to interpret the mass spectral data to identify the compound's functional groups and possible structures.

asked Jan 29 in Analytical Chemistry by ChristinaBec (270 points)

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1 answer 53 views

Given a sample of an unknown compound, use nuclear magnetic resonance (NMR) spectroscopy to identify the structure of the compound and determine the number and types of atoms in the compound's molecular formula.

asked Jan 29 in Analytical Chemistry by CaitlynConyb (490 points)

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1 answer 48 views

Determine the structure of an unknown organic compound using nuclear magnetic resonance (NMR) spectroscopy, given the following information: - The compound has a molecular formula of C6H12O2 - The NMR spectrum shows signals at 1.2 ppm (triplet), 2.3 ppm (quartet), and 3.7 ppm (doublet).

asked Jan 29 in Analytical Chemistry by EllenBurdine (450 points)

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1 answer 53 views

Determine the molecular formula of an unknown organic compound using mass spectrometry data.

asked Jan 29 in Analytical Chemistry by EdmundoFlora (590 points)

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1 answer 54 views

Determine the concentration of lead in a water sample using atomic absorption spectroscopy.

asked Jan 29 in Analytical Chemistry by DinaTrimm852 (530 points)

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1 answer 46 views

Calculate the amount of chloride ions (Cl-) present in a 0.500 g sample of a sodium chloride (NaCl) solution using coulometry. The electric current used in the process was 2.26 A, and the time taken to completely react the sample was 120 s. The molecular weight of NaCl is 58.44 g/mol, and 1 mol of NaCl contains 1 mol of Cl-.

asked Jan 23 in Analytical Chemistry by WilfredCarr3 (510 points)

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1 answer 5 views

An unknown compound was discovered in a crime investigation. Use mass spectrometry to identify the molecular formula and possible functional groups present in the compound.

asked Jan 22 in Analytical Chemistry by IvyHaddock2 (390 points)

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1 answer 7 views

An unknown compound was analyzed using mass spectrometry, and the resulting spectrum showed a molecular ion peak at m/z 214. Fragmentation patterns were also observed with peaks at m/z 121 and m/z 93. Can you identify the unknown compound and explain the fragmentation pathways leading to the observed peaks?

asked Jan 22 in Analytical Chemistry by Marguerite52 (230 points)

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1 answer 5 views

An unknown compound is synthesized in the lab and needs to be identified using mass spectrometry. Design a step-by-step plan to analyze the compound, including sample preparation, instrument settings, interpretation of data, and identification of possible functional groups.

asked Jan 22 in Analytical Chemistry by EulaliaMulli (510 points)

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1 answer 54 views

A student wants to determine the amount of chloride ions present in a sample of seawater. Using potentiometry, what is the concentration of chloride ions present in the sample?

asked Jan 22 in Analytical Chemistry by ArlenRosetta (540 points)

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1 answer 7 views

A student wants to analyze the composition of a sample of an unknown metal alloy. They dissolve a 0.500g sample of the alloy in hydrochloric acid to form a solution which is then titrated with sodium hydroxide (NaOH) to neutralize the acid. The volume of the NaOH solution required is 16.50 mL. Assuming the acid reacts with the metal in the alloy according to the formula: M + 2HCl → MCl₂ + H₂, what is the percent composition by mass of Metal M in the alloy?

asked Jan 22 in Analytical Chemistry by FlorentinaKe (350 points)

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1 answer 63 views

A student received a sample of an unknown substance weighing 5 grams. After performing a series of measurements, they found that the sample contained 2.5 grams of pure calcium carbonate and an unknown amount of impurities. Using mass balance calculations, determine the weight and composition of the impurities in the sample.

asked Jan 22 in Analytical Chemistry by SDHMillard5 (430 points)

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1 answer 43 views

A student needs to determine the amount of copper present in a sample of brass using coulometry. If the sample is dissolved in acid and subjected to coulometric analysis using a standard silver electrode, what is the concentration of copper (in ppm) in the brass sample?

asked Jan 22 in Analytical Chemistry by Skye93N8947 (310 points)

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1 answer 56 views

A student needs to analyze an unknown sample to determine the percent composition of three compounds present in it. The student conducts a combustion reaction to determine the percent of carbon and hydrogen in the sample. The remaining residue is then dissolved in water and the solution is titrated with a standardized silver nitrate solution to determine the chloride ion concentration in the sample. Calculate the percent composition of each compound in the unknown sample using mass balance calculations.

asked Jan 22 in Analytical Chemistry by TrentAdam35 (470 points)

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1 answer 38 views

A student is given a mixture of two unknown substances, one organic and one inorganic, and is asked to identify these compounds using mass spectrometry. Can you provide a step-by-step procedure using mass spectrometry to identify the two unknown compounds?

asked Jan 22 in Analytical Chemistry by NamLane0895 (470 points)

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