Recent questions in Chemistry

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What is the concentration of caffeine in a particular brand of coffee, using liquid chromatography as the primary analytical technique?

asked Jan 30 in Analytical Chemistry by KenButler21 (330 points)

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1 answer 59 views

What is the concentration of caffeine in a particular brand of coffee obtained through liquid chromatography?

asked Jan 30 in Analytical Chemistry by TanyaPridgen (570 points)

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What is the concentration of caffeine in a freshly brewed cup of coffee? Using liquid chromatography, analyze the composition of the coffee sample and determine the peak for caffeine. From the peak area and a known standard of caffeine, calculate the concentration of caffeine in the coffee sample.

asked Jan 30 in Analytical Chemistry by KingCopland (770 points)

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What is the concentration of an HCl solution if 25.00 mL of the solution requires 35.80 mL of 0.100 M NaOH to reach the endpoint during titration?

asked Jan 30 in Analytical Chemistry by DelFreud677 (440 points)

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What is the concentration of an HCl solution if 25.0 ml of the solution requires 35.0 ml of 0.10 M NaOH solution to reach the endpoint of titration?

asked Jan 30 in Analytical Chemistry by ToddPamphlet (590 points)

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1 answer 72 views

What is the concentration of a unknown copper(II) ion solution using polarography if a current of 2.5 mA is recorded at an applied potential of -0.45 V? The standard reduction potential of Cu2+ to Cu is -0.34 V.

asked Jan 30 in Analytical Chemistry by Ladonna9090 (370 points)

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1 answer 54 views

What is the concentration of a substance in a given sample, using the polarographic method with a measurement potential of -0.4 V and a current of 3.5 mA, if the substance has a limiting current of 5.2 mA?

asked Jan 30 in Analytical Chemistry by JaredKibby74 (540 points)

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1 answer 69 views

What is the concentration of a specific protein in a sample of human blood serum and how does it compare to the normal physiological range, using capillary electrophoresis?

asked Jan 30 in Analytical Chemistry by Andre355919 (530 points)

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1 answer 45 views

What is the concentration of a specific compound in a given sample using liquid chromatography?

asked Jan 30 in Analytical Chemistry by DanaAnnand5 (430 points)

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What is the concentration of a solution of iron(II) sulfate if its absorbance at a wavelength of 495 nm is 0.456 in a 1 cm cuvette with a path length of 1 cm? The molar absorptivity of iron(II) sulfate at 495 nm is 8100 L/mol·cm. The molecular weight of iron(II) sulfate is 151.91 g/mol.

asked Jan 30 in Analytical Chemistry by Quinn5964724 (410 points)

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1 answer 48 views

What is the concentration of a solution of hydrochloric acid (HCl) in moles per liter (M) if 25 milliliters of the HCl solution reacts completely with 35 milliliters of a 0.1 M solution of sodium hydroxide (NaOH) during a titration process?

asked Jan 30 in Analytical Chemistry by MilanSawyers (510 points)

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What is the concentration of a solution containing CuSO4 if its absorbance is 0.472 at a wavelength of 620 nm? The molar absorptivity of CuSO4 at this wavelength is 2.34 x 10^4. The solution has a path length of 1 cm.

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

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1 answer 53 views

What is the concentration of a solution containing an unknown amount of lead ions if it requires 25 milliliters of 0.1 M potassium iodide (KI) solution to titrate completely in a polarographic analysis?

asked Jan 30 in Analytical Chemistry by PrinceHavila (530 points)

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1 answer 69 views

What is the concentration of a solution containing 0.25 grams of copper (Cu) metal, that was dissolved in 50 mL of a 0.5 M sulfuric acid (H2SO4) solution, using coulometry? The atomic weight of copper is 63.55 g/mol.

asked Jan 30 in Analytical Chemistry by AlejandraBel (550 points)

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1 answer 54 views

What is the concentration of a sodium hydroxide (NaOH) solution if it takes 25 mL of 0.1 M hydrochloric acid (HCl) to neutralize 30 mL of the NaOH solution in a titration experiment?

asked Jan 30 in Analytical Chemistry by EarthaWieder (610 points)

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1 answer 61 views

What is the concentration of a particular protein in a given sample of blood plasma, and how does it compare to the normal concentration range? Analyze the composition of the blood plasma using the capillary electrophoresis technique and determine the concentration of the protein of interest. Compare the results with the established normal range to evaluate the potential health implications of the protein concentration in the sample.

asked Jan 30 in Analytical Chemistry by MiguelW5201 (470 points)

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1 answer 63 views

What is the concentration of a particular amino acid (e.g. glycine) in a given protein sample using capillary electrophoresis?

asked Jan 30 in Analytical Chemistry by SylvesterWil (590 points)

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1 answer 68 views

What is the concentration of a hydrochloric acid solution if 25.00 mL of it requires 34.87 mL of a 0.120 M sodium hydroxide solution to reach a neutral pH during titration?

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

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1 answer 58 views

What is the concentration of a hydrochloric acid solution if 25 ml of the solution requires 18 ml of a 0.1 M sodium hydroxide solution for complete neutralization during a titration?

asked Jan 30 in Analytical Chemistry by BuckForro541 (490 points)

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1 answer 81 views

What is the concentration of a hydrochloric acid solution if 25 mL of the solution requires 15 mL of 0.1 M sodium hydroxide for complete neutralization?

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

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