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