please help as soon is possible A coke sample is prepared by transferring 5.00 m

Question

please help as soon is possible A coke sample is prepared by transferring 5.00 ml. (plusminus 0.01 mL) of the unknown soft drink into a 100 mL (plusminus 0.08 mL) volumetric flask and diluting to volume with water. The caffeine concentration in the final solution is measured to be 4.78 ppm (plusminus 0.06 ppm). What is the concentration and standard deviation of caffeine in the original coke sample? What is the mass (in mg) of caffeine in a 12.0 fl oz. serving of this soft drink? One serving (31.0 g) of Special K^8 cereal was digested by an acid mixture and filtered to remove any solid residues. The resulting solution was diluted to 500 mL in a volumetric flask. The solution was then diluted 1 mL to 100 mL and then 5 mL to 50 mL. The concentration of Fe in the final solution was measured to be 24.4 ppb. What was the mass (in mg) of Fe in the one cereal serving? What is the wt% of Fe in one cereal serving? The Recommended Daily Allowance (RDA) of iron for an adult is 18.0 mg. What % of the RDA for iron is obtain by eating one serving of Special K*? A stock solution of Cl^- was made by dissolving 1.6845 g of NaCI in distilled water and dilute to 100 mL mark of a volumetric flask. How to make a total of five working standards with what is the Cl concentrations between I and 100 ppnt? We need five working standards covering the range between 50.0 and 500.0 ppb Pb for the analysis of Pb in drinking water. A stock solution of Pb was made by dissolving 0.1588 g of Pb(NO_3)_2 in distilled water and dilute to 100 mL mark of a volumetric flask. How should we make these working standards? Practice: Linear Regression Analysis on Data Based on the experimental data in the "regression" spreadsheet: Make a scatter plot of the data from standard solutions, using Concentrations as the. x axis and Instrument Readings as y axis. Using linear regression, what are the slope, intercept and their standard deviations, respectively? What is the r value? Use a table to report your results.

Explanation / Answer

Given-

Volume of unknown soft drink= 5ml (+/- 0.01ml)

Volume of volumetric flask = 100 ml (+/- 0.08ml)

Concentration of caffeine in final solution = 4.78 ppm (+/- 0.06 ppm)

1ppm = 1mg/L

4.78 ppm = 4.78mg/L(+/- 0.06 ppm)

4.78 mg/L x 1L/1000 mL = 4.78 x 1000/100 mg/L = .00478 mg/mL                                                       

Concentration of caffeine in original solution 5ml + 95 ml water

= 4.78 ppm x 19 = 90.82 ppm = 90.82 mg/L

= 0.09082 mg/ml

Standard deviation of caffeine in original solution is +/- 0.01ml

Mass of caffeine in 12 oz of this serving soft drink-

12oz = 354.882ml

0.09082 mg x 354.882ml = 32.23mg/354.882ml

Mass of caffeine in 12 oz of this serving soft drink = 32.23 mg

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