Using the data below, please create a calibration graph and determine the concentration ofthe unknown sample.Standard #1Standard #2Standard #3Unknown sampleConcentration1.5 x 10 M2.0 x 103 M2.5 x 10 M?Absorbance0.610.800.980.72a) 1.6 x 10 Mb) 1.8 x 10° Mc) 2.1 x 103Md) 2.2 x 10 M

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Answered: Using the data below, please create a…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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The absorbance of a cationic iron(II) sample solution was measured in a spectrophotometer, but the instrument returned an error because the absorbance was too high. The sample was then diluted by using a pipette to take 100.0 μLμL of the sample and injecting it into a cuvette already containing 2.00 mLmL of water (total volume is 2.00 mLmL + 100.0 μLμL). The absorbance value of the diluted solution corresponded to a concentration of 7.71×10−6 M M . What was the concentration of the original solution? Express the concentration to three significant figures with the appropriate units.
Ben ran through the experiment and found the best-fit line listed below for his standard calibration curve of absorbance vs concentration in M. y = 3214.0x + 0.0076 Ben then prepared a solution that had 5.00 mL 0.002 M iron(III) nitrate in 1 M nitric acid, 3.00 mL 0.002 M potassium thiocyanate, and 2.00 mL DI water. If the absorbance for the solution was 0.436, calculate the equilibrium concentration of iron(III) thiocyanate in the solution. Report your answer in mM with three places after the decimal.
STANDARD SAMPLE PREPARATIONS FOR ABSORBANCE & CONCENTRATION DATA Concentration of stock nickel sulfate hexahydrate solution = .400 Molarity Sample Volume Absorbance Concentration (In Molarity) a 5 mL .179 10 mL .329 15 mL .588 20 mL .760 25 mL .939 Reference Blank = 0 Please show how to find Molarity, please show steps. Thank you and stay safe.
Test tube Concentration (M) absorbance 1 0.0003 0.13 2 0.0006 0.27 3 0.0009 0.41 4 0.0012 0.59 5 0.0015 0.72 unknown solution 0.00054 0.26 graph are attached please check The concentration corresponding to unknown absorbance is 0.00054. Using the Absorbance of your unknown, determine the concentration of your unknown from the graph by interpolation. Include your unknown concentration in the data table. and Was Beer’s Law obeyed? Explain your answer please answer 1 and explain properly thank you all data arementioned
2- In a soil with Da = 1.30 g/cm3 at a depth of 15 cm, an absorbance value of 0.80 was obtained using 15 mL of filtration. Calculate phosphorus in units of kg/ha.
Saved Normal BIIIU fxl Ix Actual mass used in solution prep (g) Volume solution prepared Measured conductivity (uS/cm) Substance 0.1 g Naci 0.1003 100 mL 1149 0.1 g Nal 0.10 100 ml 419 Calculate the mass of Nal that would be necessary to yield the same conductivity as the NaCl solution. Clearly show these calculations in your lab notebook. Saved T BII U X X + fr Normal
Using the data and formula shown, Determine the concentration of iron in the sample and its standard deviation from the least-squares equation of the line. Compare the unknown concentration to that obtained manually from a calibration curve.
LabQuest 17 DATA TABLE Trial 1 2 3 4 5 6 Concentration (mol/L) 0.080 0.16 0.24 0.32 0.40 Unknown number Absorbance (no units) 0.2711 0.437 1.480 1.932 2.171 0.3 DATA ANALYSIS 1. Describe an alternate method for determining the molar concentration of your unknown sample of copper (II) sulfate solution, using the standard data.
An 8 mL volumetric pipet is used to collect a sample from a 0.2015 M solution of NaOH. a. Estimate the uncertainties in volume and concentration. b. Calculate the moles of NaOH in the sample. c. Use error propagation to find the uncertainty in moles of NaOH.
Suppose a normally distributed set of data with 8900 observations has a mean of 123 and a standard deviation of 16. Use the 68-95-99.7 Rule to determine the number of observations in the data set expected to be above a value of 107. Round your answer to the nearest whole value. Hint: This problem is asking for how many observations not the percent. Answer Tip: Don't round any probabilities or percentages in your calculations. Keep all decimal places and round at the END of the problem.
Chemistry. The best fit line is y = 1.03892x + 0.1448 1) If a sample had an absorbance of 0.333, what would be the concentration? 2) If a sample had a concentration of 0.40 mg/ml, what would be the absorbance?
How do you determine concentration of an unknown using standard addition method? For example, if you have five solutions with varying amounts of the unknown, 0 mL, 10 mL, 20 mL, 30 mL, and 40 mL, per 100 mL of 0.05 M solution and absorbance values for each, how would you use this to find concentration of the unknown. Would the unknown concentration be the slope of the standard addition model graph, or do you have to determine concentration of all five solutions and use these concentrations and the absorbance values to create an absrobance vs concentration graph? If so, would the slope of that graph be the concentration of the unknown.

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