Determine the concentrations of manganese in a pill
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The students determined the concentration of manganese in a pill called Arthu Z that claimed to contain 4mg of manganese. They calculated the average weight of the pills and crushed and diluted the pills to perform spectrometry analysis. The results found that the pills contained 2.7mg of manganese, less than the 4mg listed on the label. The students concluded that their hypothesis was confirmed and that federal agencies should regulate supplement production more strictly since manufacturers do not always accurately analyze product contents.
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1. The document describes an experiment to determine the concentration of manganese in a vitamin pill called Arthuan Z, which claims to contain 4 mg of manganese.
2. The experiment involved crushing and diluting the pill, then measuring the absorbance of the solutions. Calibrations solutions of known manganese concentration were also prepared.
3. By creating a calibration curve from the absorbance measurements and calculating the amount of manganese in the pill sample, the concentration of manganese in the pill was determined to be 2.718 mg, less than the labeled amount. This supported the initial hypothesis.
Review paper 2
1. The document outlines a procedure to determine the concentration of manganese in a vitamin pill called Arthu Z through dilution, reaction with acids, and spectrophotometric analysis.
2. The pill was crushed, diluted, and reacted with acids to produce a colored solution, which was then used to generate a calibration curve relating absorbance to known manganese concentrations.
3. By measuring the absorbance of the pill solution and using the calibration curve, the concentration of manganese in the pill was determined to be 2.718 mg, which is less than the labeled 4 mg amount.
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1. The document describes an experiment to determine the concentration of manganese in a vitamin pill called Arthuan Z, which claims to contain 4 mg of manganese.
2. The experiment involved crushing and diluting the pill, then measuring the absorbance of the solutions. Calibrations solutions of known manganese concentration were also prepared.
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1. The document outlines a procedure to determine the concentration of manganese in a vitamin pill called Arthu Z through dilution, reaction with acids, and spectrophotometric analysis.
2. The pill was crushed, diluted, and reacted with acids to produce a colored solution, which was then used to generate a calibration curve relating absorbance to known manganese concentrations.
3. By measuring the absorbance of the pill solution and using the calibration curve, the concentration of manganese in the pill was determined to be 2.718 mg, which is less than the labeled 4 mg amount.
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1. The students determined the concentration of manganese in an ArthuZ pill through a series of dilution and analysis steps. They weighed pills, crushed them, made dilutions in nitric acid and phosphoric acid, and observed color changes after adding sodium periodate and heating.
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Objective
Principle
Requirements
Experimental specifications (conditions)
Preparation of serotonin stock solution
Preparation of Krebs solution (PSS)
Procedure
Kymograph recording of contractions
Observation table
Calculation
Result and interpretation
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Determine the concentrations of manganese in a pill
Determine the concentrations of manganese in a pill
Determine the concentrations of manganese in a pill
- 1. Jose g. cruzrivera Cristina m. cruzirizarry Dr. resto Rise program Determine the concentrations of manganese in a pill
- 2. Introduction Analytical chemistry concentrates in the analysis of chemical components in materials. Manganese is essential in the development and maintenance of bones. Calculating the concentration of manganese in a pill called Arthu Z with 4mg of manganese.
- 3. Hypothesis When we calculate the concentration of manganese in the pill; we will find less concentration of the mineral when we compare it to the label of the package.
- 4. Procedure #1 Weight two pills and find the average weight. Find the percentage of manganese in a pill. 0.31% Crush and dilute 0.6 g of the pill with water in a beaker of 250.0 mL. Add 50.0 mL of HNO3 (Nitric Acid) to 3 aliquots and 0.25 g NaIO4 (Sodium Periodate) to only 2 of the aliquots. Heat the solutions.
- 6. Procedure #2 6 mL of KMnO4 (Potassium Permanganate) dilute in a 100.0 mL volumetric flask to make 8 aliquots of: 1, 3 ,5 , 7, 9,10, 12 and 15 mL. Using the spec-20 determine the transmittance of the 8 aliquots and the 3 other aliquots that contain the pill, then calculate the absorbance. Calculate the concentration of the 8 aliquots. After finding the transmittance of the 3 aliquots, we compared this to the transmittance of the 8 aliquots that we know the concentration.
- 8. Results We found 2.7 g of manganese(Mn) in the vitamin supplement pill.
- 9. Conclusion Our hypothesis was confirmed, the label says 4.0 mg of manganese, but we found 2.7 mg. Many pharmaceutical factories don’t analyze there products. Federal agencies should be more strict with the production of supplements.
- 10. References Silberberg, M.S.; “Chemistry, The Molecular Nature of Matter and Change”, 5ta ed.; McGraw Hill: New York, 2005. Nivaldo, J.; “Chemistry: A Molecular Approach”, 2nd ed.; Prentice Hall: Westmont College, 2008. Kotz, Treichel, Weaver; “Chemistry & Chemical Reactivity”, 6th ed.; Thomson Learning Inc., 2006.
Editor's Notes
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