In an analytical laboratory that analyzes BOD, the titrant solution of sodium thiosulphate must be standardized every 3 days. The standardized concentration can be determined with the help of standard potassium dichromate solution. This is an oxidation and reduction, as well as "Iodometric reaction". The reactions of the process are: 6 Kl + 14 HCl + K2Cr2O7 -->2CrCl3 + 3I2 + 7 H2O + 8 KCl 2 Na2S2O3 + I2 --> Na2S4O6 + 2 NaI Given the standardization data in the table below, determine the missing value as indicated by the question mark (?). Please answer and don't reject the question, thank you so much! Number of Observation Volume of 0.1065 M K2Cr2O7, mL Volume of Na2S2O3 used to titrate K2Cr2O7, mL Standardized concentration of Na2S2O3, M 1 10.0 6.65 ? 2 10.0 7.10 ? 3 10.0 6.80 ? 4 10.0 7.00 ?   Mean: ? ?   Standard deviation: ? ?

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...
icon
Related questions
Question

In an analytical laboratory that analyzes BOD, the titrant solution of sodium thiosulphate must be standardized every 3 days. The standardized concentration can be determined with the help of standard potassium dichromate solution. This is an oxidation and reduction, as well as "Iodometric reaction". The reactions of the process are:

6 Kl + 14 HCl + K2Cr2O7 -->2CrCl3 + 3I2 + 7 H2O + 8 KCl

2 Na2S2O3 + I2 --> Na2S4O6 + 2 NaI

Given the standardization data in the table below, determine the missing value as indicated by the question mark (?). Please answer and don't reject the question, thank you so much!

Number of Observation Volume of 0.1065 M K2Cr2O7, mL Volume of Na2S2O3 used to titrate K2Cr2O7, mL Standardized concentration of Na2S2O3, M
1 10.0 6.65 ?
2 10.0 7.10 ?
3 10.0 6.80 ?
4 10.0 7.00 ?
  Mean: ? ?
  Standard deviation: ? ?

 

Expert Solution
steps

Step by step

Solved in 4 steps with 4 images

Blurred answer
Knowledge Booster
Balancing of Redox Reactions
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