The Kjeldahl procedure was used to analyze 256 L of a solution containing 37.9 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.033 6 M HCl, and the remaining acid required 6.34 mL of 0.010 0 M NaOH for complete titration.
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The Kjeldahl procedure was used to analyze 256 L of a solution containing 37.9 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.033 6 M HCl, and the remaining acid required 6.34 mL of 0.010 0 M NaOH for complete titration.
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- The Kjeldahl procedure was used to analyze 244 µL of a solution containing 38.1 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.0375 M HCl and the remaining acid required 5.98 mL of 0.00998 M NaOH for complete titration. What is the weight percent of nitrogen in the protein?A researcher is tasked with analyzing pet food samples for total nitrogen by the Kjeldahl method. A 0.4731 g sample of pet food was analyzed, and liberated ammonia was collected in 50.00 mL of 0.184 M HCl. The excess of acid required a 12.42 mL back titration by 0.0925 M NaOH. Write results in terms of % total nitrogen and % wt protein as % histidine.The Kjedahl procedure was used to analyze 256 µL of a solution containing 37.9 mg protein/mL. The liberated NH3 was collected in 5.00 mL of 0.033 6 M HCl, and the remaining acid required 6.34 mL of 0.010 M NaOH for complete titration. What is the weight percent of nitrogen in the protein? wt%
- if all the N in 10.0 mmols urea, CO(NH2)2, is converted to NH4HSO4, and if, with excess NaOH, the NH3 is evolved and caught in 50.0 mL of HCl (1.00 mL = 0.03000 g CaCO3), what volume of NaOH (1.00 mL = 0.3465 g H2C2O4. H2O) would be required for complete titration? using Kjeldahl's MethodA neutralization titration was performed to determine the benzoic acid (C6H5COOH) in a 500 mL sample. In order to prepare the titrant, 5 grams of NaOH was weighed and dissolved in 1 L of distilled water. 10 mL of the sample was titrated with the NaOH solution after adding an appropriate indicator to the erlenmeyer. Four trials were done and 2.5 mL, 2.7 mL, 2.6 mL and 2.4 mL of NaOH were consumed. What is the mass of benzoic acid as gram in the sample. (C:12 g/mol, H:1 g/mol, O:16 g/mol, Na: 23 g/mol)If all the N in 10.0 mmols urea, CO(NH2)2, is converted to NH4HSO4, and if with excess NaOH the NH3 is evolved and caught in 50.0 mL of HCl (1.00 mL ≈ 0.03000 g CaCO3), what volume of NaOH (1.00 mL ≈ 0.3465 g H2C2O4.2H2O) would be required for complete titration?
- 35-36 A Fajans titration of a 0.9805-g sample required 23.32 mL of 0.1234 M AgNO₃. a) Express result of the analysis in % Cl⁻ (35.453 g/mol) b) Express result of the analysis in % BaCl₂•2H₂O (244.26 g/mol)A multivitamin sample has a label claim of 500 mg ascorbic acid (176.12 g/mol). According to quality assurance guidelines for stability, it has an acceptable range of 90.0%-110.0% of the label claim. After production, the multivitamin was analyzed through acid-base titration, and the sample needed 25.40 mL of a 0.1101 M NaOH titrant to reach the end point. After 3 months, the same multivitamin was analyzed again, and this time 23.34 mL of the same 0.1101 M titrant was used. After 6 months, the same multivitamin was analyzed again, and this time, 22.48 mL of the same 0.1101 M NaOH titrant was needed to reach the end point. If the multivitamin was manufactured on March 2021, when is its most likely expiration date? June 2021 September 2021 December 2021 March 2022A multivitamin sample has a label claim of 500 mg ascorbic acid (176.12 g/mol). According to quality assurance guidelines for stability, it has an acceptable range of 90.0%-110.0% of the label claim. After production, the multivitamin was analyzed through acid-base titration, and the sample needed 25.40 mL of a 0.1101 M NaOH titrant to reach the end point. After 3 months, the same multivitamin was analyzed again, and this time 23.34 mL of the same 0.1101 M titrant was used. After 6 months, the same multivitamin was analyzed again, and this time, 22.48 mL of the same 0.1101 M NaOH titrant was needed to reach the end point. 1. How many mg of ascorbic acid is present in the sample after production? 2. How many mg of ascorbic acid are present in the 3 month old sample? 3. How many mg of ascorbic acid are present in the 6 month old sample? 4. If the multivitamin was manufactured on March 2021, when is its most likely expiration date? a. June 2021 b. September 2021 c. December 2021…
- A multivitamin sample has a label claim of 500 mg ascorbic acid (176.12 g/mol). According to quality assurance guidelines for stability, it has an acceptable range of 90.0%-110.0% of the label claim. After production, the multivitamin was analyzed through acid-base titration, and the sample needed 25.40 mL of a 0.1101 M NaOH titrant to reach the end point. After 3 months, the same multivitamin was analyzed again, and this time 23.34 mL of the same 0.1101 M titrant was used. After 6 months, the same multivitamin was analyzed again, and this time, 22.48 mL of the same 0.1101 M NaOH titrant was needed to reach the end point.A multivitamin sample has a label claim of 500 mg ascorbic acid (176.12 g/mol). According to quality assurance guidelines for stability, it has an acceptable range of 90.0%-110.0% of the label claim. After production, the multivitamin was analyzed through acid-base titration, and the sample needed 25.40 mL of a 0.1101 M NaOH titrant to reach the end point. After 3 months, the same multivitamin was analyzed again, and this time 23.34 mL of the same 0.1101 M titrant was used. After 6 months, the same multivitamin was analyzed again, and this time, 22.48 mL of the same 0.1101 M NaOH titrant was needed to reach the end point. A. How many mg of ascorbic acid is present in the sample after production? 521.0 mg 506.7 mg 492.53 mg 488.12 m B. How many mg of ascorbic acid are present in the 3 month old sample? 492.53 mg 488.12 mg 452.58 mg 435.91 mg C. How many mg of ascorbic acid are present in the…1 How do you use the amount of 0.01 M NaOH used in titration to determine protein content? NaOH was calibrated with KHP (0.0553 g) to get an amount of 25.2 mL 0.01 M NaOH used. GR1: 71.6 mL NaOH used GR2: 91.2 mL NaOH used GR3: 86.4 mL NaOH used
