f the tolerance of a 50 mL Burette is \pm 0.05 mL, which of the following would not be acceptable readings to record? 9.3 mL 43.02 ml. 22.3 mL 0.65 mL 52.45 mL 30.07 mL 15.30 mL 36.55
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f the tolerance of a 50 mL Burette is \pm 0.05 mL, which of the following would not be acceptable
readings to record? 9.3 mL 43.02 ml. 22.3 mL 0.65 mL
52.45 mL 30.07 mL 15.30 mL 36.55
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Solved in 3 steps
- 1) determine the glassware that can be used to deliver 4.5mL with an absolute error: a) ≤ 0.15 mL b) ≤ 0.02 mL c) ≤ 0.07 mLStandardization of Sodium Thiosulfate Solution Primary Standard used: Potassium Dichromate Formula mass of 1o standard: __________________ % Purity of 1o standard: 99.80% Trials 1 2 3 Weight of K2Cr2O7 (g)Weight of K2Cr2O7 (g) 0.0315 0.0331 0.0380 Final Volume Reading Na2S2O3 (ml) 27.50 27.50 34.90 Initial Volume Reading Na2S2O3 (ml) 1.10 0.00 1.00 Net Volume Na2S2O3 used (ml) Molarity of Na2S2O31. Samples that should not be stored should be prepared/analyzed as soon as possible, especially for measurement…a. hardnessb. Nitritec. Conductivityd. Phenol 2. The following are general sample treatments in pesticide analysis, except…a. Extractionb. Cleaningc. Concentrationd. Filtering
- Table of caffeine standards concentration . Sample Conc, ppm Std1 16 Std2 32 Std3 48 Std4 64 Std5 80 If the volume used to make 100 mL of std 1 is 2 uL what is the concentration in M used to make std calibration curve ? The standards are going to be used to build calibration curve to analyze caffeine in an energy drink. if 500 mL of the energy drink has target of 400 mg , how will you prepare the sample if you need 10 mL for the analysis ? Caffeine MM=194.19 g/mol.A standard reference material is certified to contain 94.6 ppm of an organic contaminant. Your analysis gives you the follow values, 98.6, 98.4, 95.1 and 97.2 ppm. Can you say with 95% confidence that your values differ from the certified value. Please show workMean, standard deviation, Coefficient variable, and 95% confidence limits of aspirin in mg *0.3090g *0.3030g *0.3023g
- Chemistry help solve part d to h. the standard deviation is 0.0043m and the mean is 0.1052m.I would need help with these questions. The method referenced above was followed by a student and she got the following results: Caffeine Std. Conc. (ppm) Absorbance 100 1.806 50 0.899 40 0.724 30 0.545 20 0.365 10 0.183 Further, she analyzed an unknown sample and she got the following results: Sample # Absorbance 1 0.398 1. Graphically find the concentration in ppm and then calculate in mol/L of Caffeine in Sample #1? 2. Which solvent was used to extract Caffeine and why? Why is it necessary to do extraction three times? 3. Cuvettes used in this experiment were made from which material and why? 4. At what wavelength the Absorbance was measured?This is a picture of a 50-mL buret. The value for 'x' says 38 mL and the value for 'y' says a value 1 mL lower than 38. Record the value with proper estimation technique.
- Using a 25mL pipette, you prepare a standard solution by pipetting 25.00mL of the standard iron solution[0.25g/L] into a 500mL volumetric flask. Then, using a 10mL pipette you transfer a 4mL aliquot of this solution into a 50mL volumetric flask and dilute up to the mark. Calculate the % uncertainty. Question 1 options: 0.65 0.75 0.0075 0.45Seoyeon needs to prepare a 250 mL solution of 0.1000 M Na2CO3. Which glassware should she use to prepare the solution? 250-mL volumetric flask 250-mL graduated cylinder 250-mL Erlenmeyer flask 250-mL beaker For the given data set: [6.7, 7.3, 7.5, 7.2, 7.9, and 7.1] Determine the outlier using Grubbs test. Gcrit = 1.887 6.7 7.9 7.3 7.1 There is no outlier. The results of an analysis for a certain sample are given (in ppm): 20.1, 24.1, 23.5, 22.2, and 21.6. Calculate the 95% confidence interval. 20.3 ppm ≤ x̄ ≤ 24.3 ppm 20.5 ppm ≤ x̄ ≤ 24.1 ppm 20.8 ppm ≤ x̄ ≤ 24.8 ppm 21.0 ppm ≤ x̄ ≤ 24.6 ppm0.2 to 1.0 mg/ml: For each concentration, a volume of 1.0 mL should be prepared. How will you prepare these standards using micropipettes and which one would you use? There is a: 0,5-10 microliter pipette; 2-20 microliter pipette 20-200 microliter pipette 100-1000 microliter pipette.