Which species is amphoteric?

The pH at the equivalence point of the titration of nitric acid solution by sodium hydroxide solution is

Lactic acid has a pKa of 3.08. What is the approximate degree of dissociation of a 0.35 M solution of lactic acid?

The pH at the equivalence point of the titration of nitric acid solution by sodium hydroxide solution is

SO2 can react with OH-, forming HSO3- .  In this reaction,

Which of the following pairs has the stronger acid listed first?  

You need to use KH2PO4 and K2HPO4 to prepare a buffer with a pH of 7.45. Which of the following ratios of [base]/[acid] is required? For phosphoric acid, (H3PO4), Ka2 = 6.2 × 10–8.  

Calculate the minimum concentration of Ag+ ion that must be added to (or built up in) a 0.140 M Na2CrO4 solution in order to initiate a precipitation of silver chromate.  The Ksp of Ag2CrO4 is 1.2 × 10‑12.

Which species would be expected to be the most acidic?

Over a long period of time, a research team monitored the number of car accidents which occurred during rush hour in a particular county. The  following table summarizes the data relating to the day of the week on which an accident occurred. Day Monday Tuesday Wednesday Thursday Friday Number 201 192 189 193 225