chemical analysis
To quantify the amount of ethanol in an organic sample, a technician prepares a standard solution containing 0.1473 grams ethanol and 0.1847 grams decane dissolved in 1.203 grams dichloromethane. GC analysis returns peak areas of 9930 for ethanol and 7893 for decane. Next, 0.9831 grams of a sample of unknown composition and 0.2932 grams decane are added to 1.2119 grams dichloromethane. GC analysis returns peak areas of 6382 for ethanol and 11283 for decane. What is the percent by mass ethanol in the sample?
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After you done organic chemistry lab, the product was analyzed by GC. Your product produced a...
After you done organic chemistry lab, the product was analyzed by GC. Your product produced a chromatogram containing two peaks with retention times of 3.4 min and 5.6 min, respectively. Your instructor said that your product contains two product compounds, A and B. (total 50 pts) GC signal analysis, C (concentration) = RF (Yesponse factor)XA (area) From the test above, you find that peak areas of compounds A and B are 2500 and 3500. Assuming that the response factor of...
A 2.358 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was...
A 2.358 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO_3 and HCI aqueous solution. To this solution was added 1830 grams of Kl and 50.00 mL of a 0.00889 M KIO_3 solution. The excess I_3^- was titrated with 50.00 mL of a 0.02000 M Na_2 S_2 O_3 solution What was the mass percent of arsenic trichloride in the original sample?
A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach using gas chromatography...
A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach using gas chromatography mass spectrometry (GCMS). First attempts using external calibration proved difficult, as reproducibility and external standard agreement were poor. To overcome these problems, the researcher used the internal standard calibration method with chloroform as the internal standard. To begin, the researcher analyzed a sample containing 7.24 mg/L DDT standard and 3.12 mg/L chloroform as the internal standard, which produced peak areas of 3447 and 9165...
The Fe2+ (55.845 g/mol) content of a 2.264 g steel sample dissolved in 50.00 mL of...
The Fe2+ (55.845 g/mol) content of a 2.264 g steel sample dissolved in 50.00 mL of an acidic solution was determined by tiration with a standardized 0.120 M potassium permanganate (KMnO4, 158.034 g/mol) solution. The titration required 44.82 mL to reach the end point. What is the concentration of iron in the steel sample? Express your answer as grams of Fe per gram of steel Mn2+5 Fe34 H20 + 5 Fe2+ MnO8 H concentration g Fe/g steel A 1.969 g...
Using the GC analysis, can someone help me label the peaks, and figure out if the...
Using the GC analysis, can someone help me label the peaks,
and figure out if the fat in the unknown is from an animal or
vegetable source (#4 under V. Data Analysis)? Please and thank
you!
V. Data Analysis 1.) Identify the peaks in each of the two reference samples based on their known composition given in the table and relative elution times (Rt) in the sample chromatogram (see Appendix). Indicate which fatty acids were not found, if any, and...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
Extraction of solids: Experiment outlined below Draw a “roadmap” of the experiment, containing chemical structures and...
Extraction of solids: Experiment outlined below
Draw a “roadmap” of the experiment, containing chemical
structures and “layers” (organic and aqueous). This should contain
the individual reactions occurring in each step, and show which
layer the various components are present. Make sure you think about
whether the acetaminophen, caffeine and aspirin are neutral,
protonated or deprotonated.
Preliminary separation obtain a sample (1.0g) of the mixture. weigh the sample and record it. this sample should consist of a 2:1:1 mixture (by mass)...
What is the Balanced Chemical Equation? The FAS confuses me. please explain no 4 permanganate Experiment...
What is the Balanced Chemical Equation? The FAS confuses me.
please explain
no 4 permanganate Experiment 30 Oxidation-Reduction Titration and Analysis of an Unknown Mixture PURPOSE OY BXPERIMENT: Standardizo a solution of Kno4, and determine the percent by mass of Na2C204 in an unknown mixture. The process of titration may be used for the standardization of solu- tions of oxidizing and/or reducing agents, provided a suitable method for observing the andpoint of the reaction is available. When potassium peran- ganata,...
How do you calculate questions 1 - 8 for the data analysis section? A. Precipitation of CaC,O, H,O from the Salt...
How do you calculate questions 1 - 8 for the data analysis
section?
A. Precipitation of CaC,O, H,O from the Salt Mixture Unknown number Trial 1 Trial 2 1. Mass of beaker (g) 59.45 59.45 5.oS Mass of beaker and salt mixture (g) 2. 3. Mass of salt mixture (g) I, oo oS 4. Mass of filter paper (g 5. Mass of filter paper and product after air-dried or oven-dried (g) 0, 35 6. Mass of dried product (g) 7....
CHEM 242L Exp. 4 Report/ Synthesis of Oil of Wintergreen Name Score: 20 1) Assess the effectivene...
please answer all these questions, thank you.
CHEM 242L Exp. 4 Report/ Synthesis of Oil of Wintergreen Name Score: 20 1) Assess the effectiveness of the experiment and your technique by A) reporting the yield of each step in grams and percent as well as the overall percent yield (What is "overall percent yield?). SHOW ALL CALCULATIONS! B) Give a complete analysis of the identity and purity of your final product and any isolated intermediates 2 What was the purpose...
After you done organic chemistry lab, the product was analyzed by GC. Your product produced a chromatogram containing two peaks with retention times of 3.4 min and 5.6 min, respectively. Your instructor said that your product contains two product compounds, A and B. (total 50 pts) GC signal analysis, C (concentration) = RF (Yesponse factor)XA (area) From the test above, you find that peak areas of compounds A and B are 2500 and 3500. Assuming that the response factor of...
A 2.358 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO_3 and HCI aqueous solution. To this solution was added 1830 grams of Kl and 50.00 mL of a 0.00889 M KIO_3 solution. The excess I_3^- was titrated with 50.00 mL of a 0.02000 M Na_2 S_2 O_3 solution What was the mass percent of arsenic trichloride in the original sample?
A researcher was attempting to quantify the amount of dichlorodiphenyltrichloroethane (DDT) in spinach using gas chromatography mass spectrometry (GCMS). First attempts using external calibration proved difficult, as reproducibility and external standard agreement were poor. To overcome these problems, the researcher used the internal standard calibration method with chloroform as the internal standard. To begin, the researcher analyzed a sample containing 7.24 mg/L DDT standard and 3.12 mg/L chloroform as the internal standard, which produced peak areas of 3447 and 9165...
The Fe2+ (55.845 g/mol) content of a 2.264 g steel sample dissolved in 50.00 mL of an acidic solution was determined by tiration with a standardized 0.120 M potassium permanganate (KMnO4, 158.034 g/mol) solution. The titration required 44.82 mL to reach the end point. What is the concentration of iron in the steel sample? Express your answer as grams of Fe per gram of steel Mn2+5 Fe34 H20 + 5 Fe2+ MnO8 H concentration g Fe/g steel A 1.969 g...
Using the GC analysis, can someone help me label the peaks,
and figure out if the fat in the unknown is from an animal or
vegetable source (#4 under V. Data Analysis)? Please and thank
you!
V. Data Analysis 1.) Identify the peaks in each of the two reference samples based on their known composition given in the table and relative elution times (Rt) in the sample chromatogram (see Appendix). Indicate which fatty acids were not found, if any, and...
Experiment . the reduction of bencil (March 2020) Your name Sodium borohydride is a convert recent for the reduction of dehydes and ketones to 1" and 2 alcohols, respectively. The mechanism of the reaction - (below) is straightforward and is driven by boron's affinity for oxygen. In addition, given borohydride's remarkably low reactivity with OH groups under neutral and especially basic conditions, this reaction can be done in alcohol solvents. This means that (unlike LAH or Grignard reactions) no separate...
Extraction of solids: Experiment outlined below
Draw a “roadmap” of the experiment, containing chemical
structures and “layers” (organic and aqueous). This should contain
the individual reactions occurring in each step, and show which
layer the various components are present. Make sure you think about
whether the acetaminophen, caffeine and aspirin are neutral,
protonated or deprotonated.
Preliminary separation obtain a sample (1.0g) of the mixture. weigh the sample and record it. this sample should consist of a 2:1:1 mixture (by mass)...
What is the Balanced Chemical Equation? The FAS confuses me.
please explain
no 4 permanganate Experiment 30 Oxidation-Reduction Titration and Analysis of an Unknown Mixture PURPOSE OY BXPERIMENT: Standardizo a solution of Kno4, and determine the percent by mass of Na2C204 in an unknown mixture. The process of titration may be used for the standardization of solu- tions of oxidizing and/or reducing agents, provided a suitable method for observing the andpoint of the reaction is available. When potassium peran- ganata,...
How do you calculate questions 1 - 8 for the data analysis
section?
A. Precipitation of CaC,O, H,O from the Salt Mixture Unknown number Trial 1 Trial 2 1. Mass of beaker (g) 59.45 59.45 5.oS Mass of beaker and salt mixture (g) 2. 3. Mass of salt mixture (g) I, oo oS 4. Mass of filter paper (g 5. Mass of filter paper and product after air-dried or oven-dried (g) 0, 35 6. Mass of dried product (g) 7....
please answer all these questions, thank you.
CHEM 242L Exp. 4 Report/ Synthesis of Oil of Wintergreen Name Score: 20 1) Assess the effectiveness of the experiment and your technique by A) reporting the yield of each step in grams and percent as well as the overall percent yield (What is "overall percent yield?). SHOW ALL CALCULATIONS! B) Give a complete analysis of the identity and purity of your final product and any isolated intermediates 2 What was the purpose...
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