Acid-Base Titrations Hand-In

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Acid-Base Titrations Hand-In

Category: Problem solving

Subcategory: Biochemistry

Level: College

Pages: 1

Words: 275

Titrations, Indicators, and Buffers Name: Partner: See the attached rubric for more detailed information about grading.
1.(2 points) Write a series of correctly balanced chemical net-ionic equations to describe the stepwise protonation of the carbonate ion.
{Type answer here.}
2.(4 points) Include the plot you generated using the pH meter (Part II). Using the substances in the chemical equations in question 1, label each of the regions or important points in the plot with the major substances present in the solution at that point in the titration.

{Insert labeled plot here.}
3.(3 points) Based on the results from Part I and II, comment on each of the following questions.
a. Did all 3 visual indicators reach their endpoints at the same volume of acid added? If not, why not?
b. Are all three visual indicators equally “good” for this titration?
c. Which visual pH indicator(s) would you use if a pH meter weren’t available? (Explain your choice or choices.)
{Type answers to part a. here.}
{Type answers to part b. here.}
{Type answers to part c. here.}
4.(5 points) Calculate the concentration of the unknown Na2CO3(aq) stock solution based on each of the end points or equivalence points that provide reliable information about the system. Show EACH calculation you do and make sure it is clear where the data for each calculation came from. Report the average Na2CO3 concentration with the numeric error (avg. M Na2CO3 ± some number).
{Insert calculations …

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