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1) A lab technician makes three successive 5.0 mL-to-50.0 mL dilutions (like was described in your lab procedure) of a 0.970 M stock solution of copper(II) chloride, then adds 3.00 mL to a test tube initially containing 7.00 mL of an ammonia solution. Draw a simple diagram showing all dilutions (starting with the 0.970 M stock solution). What is the molarity of copper(II) ions in the test tube?

1) A lab technician makes three successive 5.0 mL-to-50.0 mL dilutions (like was described in your lab procedure) of a 0.970 M stock solution of copper(II) chloride, then adds 3.00 mL to a test tube initially containing 7.00 mL of an ammonia solution. Draw a simple diagram showing all dilutions (starting with the 0.970 M stock solution). What is the molarity of copper(II) ions in the test tube?

Chemistry
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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LAB 5 PRELAB QUESTIONS Qualitative Analysis Instructions: Complete the following questions and hand in at the start of your lab period or when instructed by your instructor. Show your work with units and correct significant figures for all questions that involve a calculation. Circle your numerical answers. 1) A lab technician makes three successive 5.0 mL-to-50.0 mL dilutions (like was described in your lab procedure) of a 0.970 M stock solution of copper(II) chloride, then adds 3.00 mL to a test tube initially containing 7.00 mL of an ammonia solution. Draw a simple diagram showing all dilutions (starting with the 0.970 M stock solution). What is the molarity of copper(II) ions in the test tube? 2) A calibration curve was prepared for the measurement of the concentration of the complex ion FeSCN2+. Find the slope, y-intercept, and correlation coefficient (R2) of the linear least-squares line (best-fit line), and write them in the spaces provided. You are required to use Excel to do this! Attach a printed copy of this plot, including a title, labeled axes, the equation of the best-fit line, and the R² value included on the plot. There are printers in the Library, you can log in with your Canvas login. Known [FeSCN²+] A 1 2 3 4 0.0000300 0.143 0.0000600 0.290 0.0000900 0.431 0.0001200 0.572 Slope: y-intercept: R² 3) Data isn't perfect! What would you expect the y-intercept to be in the previous question? 4) Relying on the calibration curve of question 2, find the concentration of FeSCN²+ in an unknown sample with an absorbance of 0.210. Use the whole best-fit line! While data isn't always perfect, it is still the actual data!
Transcribed Image Text:LAB 5 PRELAB QUESTIONS Qualitative Analysis Instructions: Complete the following questions and hand in at the start of your lab period or when instructed by your instructor. Show your work with units and correct significant figures for all questions that involve a calculation. Circle your numerical answers. 1) A lab technician makes three successive 5.0 mL-to-50.0 mL dilutions (like was described in your lab procedure) of a 0.970 M stock solution of copper(II) chloride, then adds 3.00 mL to a test tube initially containing 7.00 mL of an ammonia solution. Draw a simple diagram showing all dilutions (starting with the 0.970 M stock solution). What is the molarity of copper(II) ions in the test tube? 2) A calibration curve was prepared for the measurement of the concentration of the complex ion FeSCN2+. Find the slope, y-intercept, and correlation coefficient (R2) of the linear least-squares line (best-fit line), and write them in the spaces provided. You are required to use Excel to do this! Attach a printed copy of this plot, including a title, labeled axes, the equation of the best-fit line, and the R² value included on the plot. There are printers in the Library, you can log in with your Canvas login. Known [FeSCN²+] A 1 2 3 4 0.0000300 0.143 0.0000600 0.290 0.0000900 0.431 0.0001200 0.572 Slope: y-intercept: R² 3) Data isn't perfect! What would you expect the y-intercept to be in the previous question? 4) Relying on the calibration curve of question 2, find the concentration of FeSCN²+ in an unknown sample with an absorbance of 0.210. Use the whole best-fit line! While data isn't always perfect, it is still the actual data!
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