DOC PREVIEW
NCSU CH 202 - Lab 07 Postlab

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

1. 20/20 points Last Response | Show Details All Responses Notes In this question, you will calculate the expected pH's of your solutions, and compare them to your measurements. a. Use the data from Part A to fill in the following table. Report your calculated pH's to two places past the decimal point. Remember, pH's are calculated differently depending on whether you have a weak acid, a weak base, or a buffer.Solution # mmol HC2H3O2mmol C2H3O21-measured pH calculated pH1A18 [18] mmol0 [0.0] mmol2.87 [2.87]2.47 [2.48]2A18 [18] mmol6.0 [6.0] mmol3.96 [3.96]4.26 [4.26]3A0 [0.0] mmol18 [18] mmol7.36 [7.36]9.26 [9.26]4A6.0 [6.0] mmol18 [18] mmol4.95 [4.95]5.22 [5.22]5A12 [12] mmol12 [12] mmol4.43 [4.43]4.74 [4.74]b. Use the data from Part B to fill in the following table. Enter the equilibrium amounts of HC2H3O2 and C2H3O21- in mmol. You will need to prepare reaction tables to obtain these amounts.Solution # mmol HC2H3O2mmol C2H3O21-measured pH calculated pH1B18 [18] mmol0 [0.0] mmol2.68 [2.68]2.48 [2.48]2B14 [14] mmol4.0 [4.0] mmol3.73 [3.73]4.20 [4.20]3B9.0 [9.0] mmol9.0 [9.0] mmol4.08 [4.08]4.74 [4.74]4B3.0 [3.0] mmol15 [15] mmol4.31 [4.31]5.43 [5.44]5B0 [0.0] mmol18 [18] mmol4.31 [4.31]13.10 [13.10]c. Which run in Part A had equimolar acetic acid and acetate? Solution #5 [5]Ad. How different are the calculated and measured pH values for this run? 6.54[6.54]% % Difference = ((Calculated - Measured)*100)/Calculatede. Which run in Part B had equimolar acetic acid and acetate? Solution #3 [3]Bf. How different are the calculated and measured pH values for this run? 13.92[13.9]% 2. 1/5 points Last Response | Show Details All Responses Notes Given that carbonic acid, H2CO3, has a pKa1 = 6.37 and a pKa2 = 10.33, please answer a and b below. a. If you wanted to make a pH 7 buffer solution starting with NaHCO3(aq), would you add 0.10 M HCl or 0.10 M NaOH? (o) (o) 0.10 M HCl (_) (_) 0.10 M NaOH b. If you began with 13.0 mL of 0.12 M NaHCO3, how many mL of your choice from above would you need to add to get a pH 7 buffer? (No Response)[2.96]


View Full Document

NCSU CH 202 - Lab 07 Postlab

Download Lab 07 Postlab
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Lab 07 Postlab and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Lab 07 Postlab 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?