Nitrite is a common food preservative. It can be detected by titrating a nitrite-containing sample with a solution of iodine, which converts nitrite to nitrate.
a) give an overall reaction to describe the process
b) How could you detect the endpoint of this titration?
c) If a sample solution that contains sodium nitrite consumes 1.55mL of a 0.00510 M solution of iodine during a titration, what mass of sodium nitrite is present in the sample?