C. Standardization of HCI titrant 1. Dry 1.5 to 2.0 g pure NazCOs in a glass weighing bottle at 150 to 160°C for at least 2h. Allow cooling in a desiccator. 2. Weigh 0.15 g (±0.3 mg) portions of the dry material into clean Erlenmeyer flasks. Do triplicate measurements. 3. Add about 50 mL of distilled water to each and swirl gently to dissolve the salt. 4. Add 4 drops of bromocresol green indicator and titrate with the HCI solution to an intermediate green color. 5. When the solution already turned into green, stop the titration and boil the solution gently for a minute or two, taking care that no solution is lost during the process. Cool the solution to room temperature, wash the flask walls with distilled water from wash bottle, and then continue the titration. Just before the end point, the titrant is best added in half drops (follow instructor's demonstration for the half-drop technique). 6. Record the burette reading. Use the indicator correction to compute the molarity of HCI. Note: Do not forget to subtract first the volume for the indicator correction.
C. Standardization of HCI titrant 1. Dry 1.5 to 2.0 g pure NazCOs in a glass weighing bottle at 150 to 160°C for at least 2h. Allow cooling in a desiccator. 2. Weigh 0.15 g (±0.3 mg) portions of the dry material into clean Erlenmeyer flasks. Do triplicate measurements. 3. Add about 50 mL of distilled water to each and swirl gently to dissolve the salt. 4. Add 4 drops of bromocresol green indicator and titrate with the HCI solution to an intermediate green color. 5. When the solution already turned into green, stop the titration and boil the solution gently for a minute or two, taking care that no solution is lost during the process. Cool the solution to room temperature, wash the flask walls with distilled water from wash bottle, and then continue the titration. Just before the end point, the titrant is best added in half drops (follow instructor's demonstration for the half-drop technique). 6. Record the burette reading. Use the indicator correction to compute the molarity of HCI. Note: Do not forget to subtract first the volume for the indicator correction.
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...
Related questions
Question
How do you to this? I'm confused.
The volume of HCI is 12 M
Transcribed Image Text:Part C
Standardization of HCl titrant
Mass Na2CO3
Initial Volume,
|(99.98%), g
Final Volume, mL
0.0
mL
Trial 1
Trial 2
Trial 3
0.1519
26.2
0.1523
0.0
26.0
0.1497
0.0
27.6
Transcribed Image Text:C. Standardization of HCI titrant
1. Dry 1.5 to 2.0 g pure Na2CO3 in a glass weighing bottle at 150 to 160°C for at least
2h. Allow cooling in a desiccator.
2. Weigh 0.15 g (10.3 mg) portions of the dry material into clean Erlenmeyer flasks. Do
triplicate measurements.
3. Add about 50 mL of distilled water to each and swirl gently to dissolve the salt.
4. Add 4 drops of bromocresol green indicator and titrate with the HCI solution to an
intermediate green color.
5. When the solution already turned into green, stop the titration and boil the solution
gently for a minute or two, taking care that no solution is lost during the process. Cool the
solution to room temperature, wash the flask walls with distilled water from wash bottle,
and then continue the titration. Just before the end point, the titrant is best added in half
drops (follow instructor's demonstration for the half-drop technique).
6. Record the burette reading. Use the indicator correction to compute the molarity of
HCI. Note: Do not forget to subtract first the volume for the indicator correction.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 6 steps with 1 images
Knowledge Booster
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.Recommended textbooks for you
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781305957404
Author:
Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:
Cengage Learning
Chemistry
Chemistry
ISBN:
9781259911156
Author:
Raymond Chang Dr., Jason Overby Professor
Publisher:
McGraw-Hill Education
Principles of Instrumental Analysis
Chemistry
ISBN:
9781305577213
Author:
Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:
Cengage Learning
Organic Chemistry
Chemistry
ISBN:
9780078021558
Author:
Janice Gorzynski Smith Dr.
Publisher:
McGraw-Hill Education
Chemistry: Principles and Reactions
Chemistry
ISBN:
9781305079373
Author:
William L. Masterton, Cecile N. Hurley
Publisher:
Cengage Learning
Elementary Principles of Chemical Processes, Bind…
Chemistry
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY