BUT the downstream value is only 1 standard deviation of the upstream value removed from same. This is the situation as given in Case 2, P. 78-79 in Harris. Each tablet weighs 1.00 g, and is dissolved in 4 tbsp of water. Using the buret and pH meter which Aunt Minnie purchased second-hand from the local high school's old equipment sale, you obtain two titration curves. Four curves are shown below.
Sodium bicarbonate is an ampholyte.
Thus, the highest pH this titrant can give is 8.36. So curves 1 and 3 can't be right, leaving 2 and 4 as the titration curves you could actually get. Comparing the pK a 's, titration 2 must be the aspirin, while Titration 4 is the vitamin C. 3. Buffer preparation You want to make 1 L of 0.1 M pH 9 buffer. The first 4 points on this problem are a freebie.