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- Come up with a dilution scheme for a test solution starting from 1000 μg/mL Mn stock solution so that the concentration of permanganate in the solution just prior to measurement is approx. 20 μg/mL MnO4-. Carefully read the units!4. A fat sample with combination of acids contain standard hydrochloric acid for blank and sample with 8mL and 5mL respectively. The normality of the standard hydrochloric acid is 0.93N and the weight of the sample is 3 grams. Calculate the saponification value.You have a stock solution certified by a manufacturer to contain 175.0 + 0.3 mg SO;-/ml. You would like to dilute it by a factor of 100 to obtain 1.750 pg/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties. Glassware Tolerance 1-mL transfer pipet 10 mL transfer pipet 100-ml volumetric flask +0.006 ml. 10.02 ml. +0.08 ml. Method A: Dilute 10.00 mL up to 100 mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL. absolute uncertainty: + wg/mL Method B: Dilute 1.000 ml. up to 100 ml. with a transfer pipet and volumetric flask. absolute uncertainty: + wg/mL Why is one method more precise than the other? O Method B is more precise because the percent relative uncertainty in the l-mL pipet is 0.6%, which is 3 times larger than the uncertainties of the other glassware. O Method B is more…
- 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.ASSAY Calibration solutions Calibration solutions of naproxen in the range 5 – 25 μg/mL were prepared. Sample preparation 20 tablets weighing 12.3819 g were crushed to a fine powder. A portion of the powder (145.4 mg) was shaken with approximately 150 mL of acetic acid (0.05 M) for 5 min and then made up to volume in a 250 mL volumetric flask (stock solution). Approximately 50 mL of the stock solution was filtered and a 25 mL aliquot was diluted to 100 mL in a volumetric flask. 10 mL of the resulting solution was further diluted to 100 mL with acetic acid (0.05 M). Analysis The standards and sample solutions were analyzed by HPLC under the following conditions: Column: octadecylsilyl (ODS), 4.6 mmx150 mm, mobile phase: acetonitrile : 0.05 M acetic acid (85:15), flow rate: 1 ml/min, UV detection at 243 nm. Results: A calibration curve of concentration versus peak area was constructed for the standard solutions and gave the straight-line equation: y = 3555.6x + 85, r = 0.9999 The area…Calculate the molarity please h. 1.2 grams of hydrochloric acid (MW = 36.46) in 25 mL of solution 1.2gx 25mL 0X22motes i. 45 grams of ammonia (MW = 17.03) in 0.75 L in solution 459x1 75 L = 33.75 ÷ 17.03 = 1.98 notes
- Sum of coefficients C7H8 + O2 --> CO2 + H2O after balancingA pipet delivers 10.9 mLmL , 10.1 mLmL , and 10.9 mLmL in consecutive trials. Find the mean volume of the samples. = Answer = 10.6 mL Part B What is the average deviation from the mean for the above samples?ll vodafone TR 4G 01:36 @ %100 ( Notlar 1) Question: It is desired to prepare 1 liter of sulfuric acid solution in 6 norms. How many ml of 98% sulfuric acid with a density of 1.84 is required for this?
- An HPLC method was developed for the separation and determination of ibuprofen in blood samples. A 3.00 mL blood sample dissolved in 70.00 mL solvent was prepared and 10.0 mL was injected into the HPLC. Standard ibuprofen solutions were also run.Calculate the ibuprofen present in the 3.00 mL blood sample The following data were obtained. Table po itoo: Ibuprofen concentration, mg/ml0.50 1.0 2.0 3.0 Blood sample Peak area (Right column)5.29.617.419.911.4In measuring the surface tension of a liquid (drop weight method), 20 drops of the liquid (r=0.2cm) falling apart from the tip whose diameter is 0.4cm were found to weigh 0.95 gram. What is he surface tension of the liquid? Show complete solution, and round the final answer up to 4 decimal places.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