Homework Help is Here – Start Your Trial Now!
Science
Chemistry
What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?

What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?

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...
See similar textbooks
icon
Related questions
Question
1. What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?
A UV-Vis spectrophotometry experiment for the determination of an unknown copper compounds was carried out by first preparing 250.0 mL of a 100.0 mg/L Cu(II) stock solution using a 100% pure copper(II) chloride dihydrate, CuCl₂-2H₂0. Appropriate volumes of this stock solution were then pipetted, added with concentrated ammonia, and diluted in volumetric flasks to come up with 50.00-mL standard solutions with concentrations of 0, 2.50, 5.00, 10.00, 25.00, and 50.00 mg/L. For the copper sample, a 50.00-mL solution was prepared by dissolving 3.25 mg of the unknown compound. The absorbance of the blank, standards, and the unknown sample were then measured at the analytical wavelength of 610 nm. The relevant data are shown below. Solution Concentration (mg/L) Volume (mL) Absorbance Blank 0 50.00 0.028 Standard 1 2.50 50.00 0.121 Standard 2 5.00 50.00 0.222 Standard 3 10.00 50.00 0.442 Standard 4 25.00 50.00 0.902 Standard 5 50.00 50.00 1.920 Sample ? 50.00 0.989
Transcribed Image Text:A UV-Vis spectrophotometry experiment for the determination of an unknown copper compounds was carried out by first preparing 250.0 mL of a 100.0 mg/L Cu(II) stock solution using a 100% pure copper(II) chloride dihydrate, CuCl₂-2H₂0. Appropriate volumes of this stock solution were then pipetted, added with concentrated ammonia, and diluted in volumetric flasks to come up with 50.00-mL standard solutions with concentrations of 0, 2.50, 5.00, 10.00, 25.00, and 50.00 mg/L. For the copper sample, a 50.00-mL solution was prepared by dissolving 3.25 mg of the unknown compound. The absorbance of the blank, standards, and the unknown sample were then measured at the analytical wavelength of 610 nm. The relevant data are shown below. Solution Concentration (mg/L) Volume (mL) Absorbance Blank 0 50.00 0.028 Standard 1 2.50 50.00 0.121 Standard 2 5.00 50.00 0.222 Standard 3 10.00 50.00 0.442 Standard 4 25.00 50.00 0.902 Standard 5 50.00 50.00 1.920 Sample ? 50.00 0.989
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 5 steps with 1 images

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Solutions
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Chemistry
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
SEE MORE TEXTBOOKS