equivalent point is on the graph and referring to the actual points plotted will allow you to obtain the value. Through using a negative log and rearranging it so 10 raised to the previous negative value is how to find the K a1 and K a2 values. Determining the final value we found the concentration with the volume and moles. E.) Reflection 1. No, I expected there to be three equivalence points for the acid. Due to the acid donating a hydrogen acid in order to get an equivalent point. Possibly due to a third high pH may be why we didn’t see the last equivalent point when charted out. 2. The equivalence point concentrations for the H 3 PO 4 in Sodastream Dr.Pete varied more than the H 3 PO 4 solution . With a starting value .408 and an average of .00745 a difference of .40055. 3. Some of the k a values are very similar to those in the book, including 1.1*10^-2 ours was 1.4*10^-2 and there other closes one would have been 2.9*10^-8 our value was 1.07*10^-7. (Source found in chapter 15.4 page 705 of the textbook.) 4. By checking the titration during the time for effervescence or bubbles may be an approach to being able to tell if the soda was no longer carbonated.
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