Question 4 (1 point) You analyze a series of standards ranging from 1% to 10% DEET, which have peak areas of 110 to 1200. You then analyze a sample of commercial insect repellent which gives a peak area of 1212. What are scientifically relevant possible next step(s)? Dilute the commercial sample 1mL into 10 mL and re-analyze Report >10% Dilute the commercial sample 1 mL in 20 mL and re-analyze Substitute 1212 for y and solve for x
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- analyte concentration(C)(mg/ml) injection volume (ul) elution time (time) peak DAD signal(mAU) caffeine 1 1 4.67 302.85 aspartame 5 1 7.53 15.83 benzoic acid 1 1 8.14 89.98 saccharin 1 1 1.91 84.86 mixture(add everything above with 1:1:1:1 ratio) 1 4.47 69.58 How to get the concentration of the mixture in this case?Extraction Pre-Lab Question 14 Status: Not yet answered | Points possible: 1.00 Type answer: Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. Calculate the volume (in mL) of the 1.410 M stock NaOH solution needed to prepare 250.0 mL of 0.1273 M dilute NaOH solution. here to search 2 F12 P Cla Hon50 Percentage Red No. 40 Soln 100% 80% 60% 40% Table 4.1: Dilutions of Red No. 40 & Absorbance Volume of Red No. 40 Soln (mL) 10me 8mL опи 4mL Percentage Red No. 40 Soln 100% 80% 60% 40% 20% Volume of DI Water (mL) OML 2mL LIML M UML 8ML Table 4.2: Dilutions of Red No. 40 & Absorbance Concentration Red No. 40 2. Report the wavelength with the maximum absorbance of Red No. 40 dye. Absorbance 20% 2ML Part A: Making a Calibration Curve for Beer's Law 1. Calculate the concentrations of each of your diluted Red No. 40 solutions and add these to Table 4.2. Show at least one sample calculation in the space below. 0.251 0.192 Total Volume 0.181 0·119 0.060 (mL) 10 mL 10 mL 10 mL 10 mL 10 mL
- -3 A 0.3202 (±0.0001) g sample of a pure monoprotic acid required 20.04 (±0.02) cm° of 0.1005 (±0.0005) mol dm neutralisation. Find the molar mass of the acid in g mol together with its uncertainty also in g mol, with an appropriate number of digits. NaOH for -1 Select one: a. 1.59 x 102+ 0.2 g mol b. 1.60 x 10 + 0.03 g mol C. 1.590 x 102 + 0.03 g mol d. 1.590 x 10- + 0.2 g mol 1.60 x 10-+0.2 g mol е. Clear my choiceDetermine the concentration of linalool in a highly valued lavender essential oil. The peak areas of a series of standard solutions (calibrations standards) acquired from GC-MS (gas chromatography-mass spectrometry) is presented below. Concentration (mg/L) Peak area 0 201 25 5214 50 14658 75 23647 100 32657 125 42652 150 52478 QUESTION: Calculate the concentration of linalool in yourhighly valued lavender essential oil which returns a peak area of 27235.Please answer 4-10. No need for explanation, I just need an answer and analyze it by myself.
- 2- 3. A moderate test for SO4 is to be expected whenever you have SO3 in an unknown solution even when no SO4 has been placed in the solution. Why?Analysis of Percent Organic Matter of * a soil sample was conducted and the data are shown below. Calculate the Percent Organic Matter of the sample. (Write answer with 3 significant figures with no %unit) Deionized water blank Reagent blank Sample with reagent Absorbance 0.001 0.089 1.231 Standard Solution (%) Absorbance 10 20 40 80 100 0.291 0.489 0.889 1.692 2.07502A: 2.1-2.5 and Accuracy Handout (70 min) ulate Figures of Merit for Trueness ▾ Part A. Absolute Error A breathalyzer is a portable electrochemical instrument that measures the concentration of ethyl alcohol in a sample of exhaled breath A forensic chemist checks the calibration of a breathalyzer by testing a standard air sample known to contain 0.174 mg/L of ethanol seven times. The average value of these seven replicate measurements is found to be 0 157 mg/1 Calculate the absolute error of the breathalyzer. 1971 ΑΣΦΑ Submit Previous Answers Request Answer ? Previous x Incorrect; Try Again: 4 attempts remaining Q Search mgl ly Colle 16 of 17 E dx Next 11:44 PM 1/31/202 BANG &
- 1 of 2 - + Automatic Zoom 1. In this experiment, you will make a set of solutions containing different concentrations of crystal violet (CV) by mixing different volumes of a stock CV* solution with water to give final volumes of 3.0 mL. The stock solution of CV+ has a concentration of 2.0 x 10-5 M and is dark purple. The diluted solutions will be prepared in cuvettes. 2.0 x 105 M CV* (purple) H₂O V1 diluted samples of CV* in cuvettes 3.0 mL= V₂ Use c₁V₁= C₂V₂ to calculate the volume of the stock 2.0 x 105 M CV+ AND the volume of water to make a 3.0 mL sample of 7.5 x 10-6 M CV+. Show all of your calculations.If an instrument gives a response of 1240 for a standard containing 8 ppm of a substance, how much if this substance is in a sample that gives a response of 1705? Are any assumptions needed?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…