B. Same as Part A, but three determinations are made: Sample 1 Sample 2 Sample 3 mass of sample 0.4892 g 0.3981 g 0.3429 g mass of barium sulfate 0.8462 g 0.6890 g 0.5938 g Find the mass percent SO42- for each sample, the average percent SO42- (mean), and the average deviation from the mean (precision index).
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Answer B, show all work and correct number of sig figs.
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- 6 PLEASE PROVIDE THE INTERPRETATION OF ALL SAMPLES FOR HELPFUL RATINGS. THANK YOU. *INCLUDE ALL YOUR REFERENCESA 0.9092 g sample of wheat flour was analysed by the Kjeldahl procedure. The ammonia formed was distilled into 50.00 mL of 0.02532 M H2SO4. A 7.46 mL backtitration of 0.04917 M NaOH was required. (Note the stoichiometry of your acid and base) Calculate thea. %N (FM=14.007) in the sample,b. %Protein in the sample (factor = 5.70)You have finished two trials of the sample analysis for the experiment and you noticed that the burette is almost empty (~5 mL remaining). Should you add more titrant before the next sample analysis or not? Why or why not? Select one: YES. It will not affect the calculations and not cause error NO. It will affect the calculations and cause error Neither A nor B Cannot be determined
- Please help me answer these question 4. Does the pooling of results in this experiment yield an average % Mg in MgO, which is closer to the accepted value than your class average? 5. Compare the precision obtained by your class to the precision obtained by the composite of all classes. Discuss. 6. What conclusion can you draw from the analysis of the data in assessing whether this laboratory procedure gives accurate results?Method used was Volhard Method Sample preparation: 5ml sample diluted in 100 ml. 20ml aliquot was used for analysis. Concentration of AgNO3: 0.0609M Calculate mass of NaCl and % NaCl (w/v)Mass of original mixture: 0.280g Mass of naphthalene recovered: 0.160 g Mass of 3-nitroaniline recovered: 0.015 g Mass of benzoic acid recovered: 0.135 g 1. a) calculate % by mass of naphthalene, 3-nitroaniline and benzoic acid in original sample 1. b) calculate total mass of three recovered components (g) 1. c) calculate total percent recovery (%)
- On their second titration trial, the CHM 111 student recorded an Initial titrant volume of 9.95 mL and a Final titrant volume of 29.80 mL. Using the correct number of significant figures, what volume of titrant was used?An individual combined 1.692 g 4-aminophenol with 2.6 mL acetic anhydride, as described in the Experiment 5 procedure. A mass of 1.628 g pure and dry acetaminophen was obtained. What was this individuals percent yield? Report your answer to two decimal places.Example: A distillation model containing a certain percentage of water was taken from the model 25 ml and the amount of water that was discarded after the separation process was 2 ml Calculate the percentage of water that was isolated from the model
- Chromatography question A student properly sets up a column chromatography experiment. Although the mixture is soluble i the mobile phase, the sample appears "stuck" at the top of the column and will not elute eregardless of how much solvet is pplaied. what could bee the cause of this issue and what could teh student try to achieve a successful separation?What do you call the type of analytical method that relies on the absolute stoichiometric equivalences of balanced chemical reactions in order to compute the amount of analyte present in the sample? a.Oxidative methods b.Classical methods c. Blank Correction Methods d. Instrumental methodsWhat are the types of gravimetric methods? Give an examples where each method is used in an analysis.