Vitamin C Analysis, a student accidentally puts 1.0 g of sodium bicarbonate (NaHCO3) solid into the vitamin sample solution for trial #1 instead of 0.5 g as the procedure instructs. How does this procedural change impact the calculated milligrams of ascorbic acid in the sample?
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Vitamin C Analysis, a student accidentally puts 1.0 g of sodium bicarbonate (NaHCO3) solid into the vitamin sample solution for trial #1 instead of 0.5 g as the procedure instructs. How does this procedural change impact the calculated milligrams of ascorbic acid in the sample?
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- Table of chemicals and reagents with their physicochemical properties (name, molecular formula, molecular weight, pKa, melting point, boiling point, etc.) Write a short outline or a flow diagram of the procedure List and safety issues Read and understand the MSDS information for each chemical used in this practical Experimental procedure Please do not scratch the clear sides of the UV cuvettes as this will invalidate your results. Part 1: Preparation of a calibration curve A calibration curve should be constructed using at least five concentrations of the pure paracetamol standard supplied in the range 3-15 ug/mL as follows: Weigh about 150 mg of paracetamol accurately and transfer to a 200 mL volumetric flask. Add 50 mL of o.1 M NaOH and dilute to about 100 mL with deionised water (DI). Shake and make up to volume with DI water. Dilute 10 mL of the resulting solution to 100 mL (volumetric flask) with DI water (= stock solution). Prepare standard solutions containing 3, 6, 9, 12 and 15…Should be 3 answers in total. Will thumbs up! Next the student conducts two different runs: In RUN 1, 10.0 mL of 5.00 M NAOH is combined with 10.0 mL of 0.010 M CO and 80.0 mL of wate In RUN 2, 20.0 mL of 5.00 M NAOH is combined with 10.0 mL of 0.010 M CO and 70.0 mL of wate The following plots were obtained for each of the runs: [crystal orange] vs time (RUN 1) In[crystal orange] vs time (RUN 1) 0.0012 0.001 -2 y--0.4463x- 7.3334 y =-0.0002x + 0.0007 R- 0.6565 R = 0.893 0.0008 4 0.0006 -6 0.0004 -8 0.0002 0.0002 -12 time (hr) time (hr) 1/[crystal orange] vs time (RUN 1) 1/[crystal orange] vs time (RUN 2) 12000 25000 10000 20000 8000 15000 6000 y = 2000x + 1000 R =1 10000 y 4000x + 1000 R =1 4000 2000 5000 time (hr) time (hr) Figure 4. Kinetic traces for the reaction between crystal orange and sodium hydroxide. What is the order with respect to CO? | Select ] What is the order with respect to NaOH? | Select ] What is the value of the averaged rate constant for the reaction above? Give…For the following questions (Q1-Q5), consider the compound tartrazine (Yellow 5 food dye) that has a chemical formula of C16H9N4Na3O9S2. Ana weighs out 0.1328 g of tartrazine powder on the balance for her experiment and makes a stock solution by dissolving her powder in 500.0 mL of solution. Concentration (µM or µmol/L) Absorbance 0.00 0.001 9.94 0.252 19.9 0.506 29.8 0.738 39.8 1.018 slope (m): 0.02534 1/(µM) y-intercept (b): -0.0009147 Q5. If Ana determines the absorbance of an unknown tartrazine sample to be 0.662, what is the concentration of the sample in µM?
- For the following questions (Q1-Q5), consider the compound tartrazine (Yellow 5 food dye) that has a chemical formula of C16H9N4Na3O9S2. Ana weighs out 0.1328 g of tartrazine powder on the balance for her experiment and makes a stock solution by dissolving her powder in 500.0 mL of solution. Concentration (µM or µmol/L) Absorbance 0.00 0.001 9.94 0.252 19.9 0.506 29.8 0.738 39.8 1.018 slope (m): 0.02534 1/(µM) y-intercept (b): -0.0009147 Q4. Calculate the molar extinction coefficient (molar absorptivity) of tartrazine in units of 1/(M·cm). Assume a cuvette path length of 1.00 cm.The sample containing 4.2 % NaCl will be determined gravimetrically as AgCl. What weight (in milligrams) of the sample must be taken to obtain a precipitate that will weigh about 0.39 mg? FM: NaCl = 58.44 AgCl = 143.3 %3D Answer in two decimal places. Do not include units in the answer. Answer:The Ksp value for calcium sulfate [CaSO4] is 2.40 X 10-5 so if a professor made 1825 mL of a CaSO4lag) solution then how many grams of sulfate (SO42) ion would be present in this solution. 0.8345 gram SO42- ion 0.8588 gram SO42- ion 0.9331 gram SO42- ion 1.0036 gram SO42- ion 0.8921 gram SO42- ion 2.. 591..docx W- LAB EXP. #3 -.docx Show All
- How to determine the difference between primary , secondary and tertiary alcohol in the laboratoryDetermine 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.In this experiment you will use 5.20 g of Ph3P+CH2CO2Et Br–. How many millimoles is this?
- (4-10 only) A bottle of aromatic ammonia spirit has been recalled from the market for containing less amount of ammonia as compared with the content declared on its label. The label claims that it contains 2% v/v of ammonia. To confirm the legitimacy of this claim, an Assay testing must be conducted to quantify the amount of ammonia present in each bottles. The assay will involve reacting whatever amount of ammonia present in 10 mL sample with 30 mL of 0.25 M sulfuric acid for this reaction to occur: 2NH3 + H2SO4 → (NH4)2SO4 1. If the label claim of 2% v/v ammonia is true, how many moles of ammonia from a 10 mL sample will be available to react with sulfuric acid? The molar weight of ammonia is 17.031 g/mol. The density of ammonia is 0.73 g/mL. 0.0086 mol B. 0.0117 mol C. 0.0161 mol D. 0.1609 mol 2. Given the calculated moles of ammonia from the previous item, how many mL of 0.25 M Sulfuric acid is expected to react with it? 17.2 mL B. 22.2 mL C. 24.4 mL D. 26.8 mL 3. Therefore, of the…✓ Question Completion Status: Shown below is a calibration curve for the analysis of theobromine and caffeine in chocholate. if an unknown sample has a caffiene peak height of 3.50 cm what is the concentration of caffeine in the sample in ppm? 20 Peak height (centimeters) 15 10 5 0 Theobromine y = 0.1977x-0.2104 25 Unknown Figure 0-7 Gumantative Chemical Analysis, Seventh Edition 2007 Freeman and Company Caffeine y = 0.088 4x-0.030 3 50 Analyte concentration (parts per million) 100 M ED Feb 2 8:3Table 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. X