Homework Help is Here – Start Your Trial Now!
Science
Chemistry
hen the solutions were reacting a colloidal precipitate formed. Is it necessary to remove the colloidal suspension before analysis? Explain your logic clearly

hen the solutions were reacting a colloidal precipitate formed. Is it necessary to remove the colloidal suspension before analysis? Explain your logic clearly

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

When the solutions were reacting a colloidal precipitate formed. Is it necessary to remove the colloidal suspension before analysis? Explain your logic clearly

A consignment of methanol was transported to South Africa from India by sea. The methanol was believed to have been contaminated by sea water during the voyage. The buyer of the methanol stipulates that the chloride concentration must be less than 2 mg/L. A sample of the methanol was sent to the laboratory for analysis. Samples were analysed by transferring 10 mL aliquots of the sample into four 25 mL volumetric flasks that had varying amounts of a 154 ppm chloride standard added to them. To each volumetric flask, 2 mL of saturated Hg(SCN)2 and 2 mL Fe (III) was also added. The Hg(SCN)2 reacts with the chloride ion and releases the thiocyanate ion which subsequently reacts with the Fe (III). The solutions were mixed, made up to the mark with pure methanol and measured using a spectrophotometer. The following results were obtained (Table 4).
Transcribed Image Text:A consignment of methanol was transported to South Africa from India by sea. The methanol was believed to have been contaminated by sea water during the voyage. The buyer of the methanol stipulates that the chloride concentration must be less than 2 mg/L. A sample of the methanol was sent to the laboratory for analysis. Samples were analysed by transferring 10 mL aliquots of the sample into four 25 mL volumetric flasks that had varying amounts of a 154 ppm chloride standard added to them. To each volumetric flask, 2 mL of saturated Hg(SCN)2 and 2 mL Fe (III) was also added. The Hg(SCN)2 reacts with the chloride ion and releases the thiocyanate ion which subsequently reacts with the Fe (III). The solutions were mixed, made up to the mark with pure methanol and measured using a spectrophotometer. The following results were obtained (Table 4).
Methanol sample (mL) Volume of standard CI Absorbance solution added (mL) at 580 nm 0.076 0.135 0.205 10 10 0.10 10 0.20 0.30 10 0.271 0.3 0.25 0.2 y = 0.655x + 0.0735 R? = 0.99891 0.15 0.1 0.05 0 + 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 Volume of chloride standard added (mL) Figure 1: graph of absorbance vs. volume of chloride standard added (mL). Absorbance at 580 nm
Transcribed Image Text:Methanol sample (mL) Volume of standard CI Absorbance solution added (mL) at 580 nm 0.076 0.135 0.205 10 10 0.10 10 0.20 0.30 10 0.271 0.3 0.25 0.2 y = 0.655x + 0.0735 R? = 0.99891 0.15 0.1 0.05 0 + 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 Volume of chloride standard added (mL) Figure 1: graph of absorbance vs. volume of chloride standard added (mL). Absorbance at 580 nm
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Molecular Interactions in Liquids
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