Question 13 Given the following Data Conc Abs 0.983 0.821 0.876 0.689 0.624 0.427 0.411 0.223 0.297 0.147 Construct a curve and using linear regression determine the concentration if the absorbance is 0.104? (You may use your calculator or excel)
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- Determine the slope of the linear regression line for a standard curve of concentration versus absorbance using the following data. Concentration (M) Absorbance 2.00x10-5 0.0500 5.00x10-5 0.130 1.00x10-4 0.200 2.00x10-4 0.450 5.00x10-4 1.25 7.50x10-4 1.40 Group of answer choice 5.00x10-4 1.00x10-5 1990 0.0420 0.456 0.296To test a spectrophotometer’s accuracy, a solution of 60.06 ppm K2Cr2O7 is prepared and analyzed. This solution has an expected absorbance of 0.641 at 350.0 nm. Several aliquots of the solution produce the following absorbance values. 0.640 0.638 0.640 0.639 0.640 0.639 0.638 is there any significant difference between the experimental mean and the expected value at a 99.9% confidence level? Question 21 options: Yes because tcal<tcritical Yes because tcal>tcritical No because tcal<tcritical No because tcal>tcriticalConcentration [M] Absorbance Solution 1 86.29 0.64 Solution 2 51.986 0.29 …. Fig 1: [graph of the calibration curve, make sure to show: function, R2, 0 intercept]
- Use least square regression to determine the best straight line and slope; compare the slope from 5 & 6. Concentration (M) Absorbance (no units) 0.10 0.09 0.20 0.14 0.30 0.19 0.40 0.27 0.50 0.30 0.60 0.34 0.70 0.37Explain the reason 4-point probe method is considered to be more accurate than 2-point probe method.Compare Chromatographic and Spectroscopic methods for pharmaceutical analysis? Please answer at your own easy words. Answer should be to the point.
- Calculate the molar concentration for a sample dye solution with a measured absorbance of 0.304. (Hint: Use linear regression analysis.). Final answer in 3 significant figures.The original solution was diluted by a factor of three, and then the absorbance of the diluted cereal sample solution was measured and recorded as (2.0x10^-1). Use the following trendline and dilution factor to determine the concentration of iron, in unit of M, in the original cereal sample solution. The trendline (linear regression) as displayed on the plot is y = 11898x - 0.0112.Test Tube Number Cobalt Chloride Concentration (mol/mL) Absorbance at 510 nm 1 0.000 0.000 2 0.009 0.042 3 0.018 0.92 4 0.027 0.139 5 6 0.036 0.045 0.190 0.236 7 (Unknown) 0.151 1. what is the concentration of unknown cobalt chloride solution? 2. why is the absorbance at the absorption peak ?