A student rushed through this experiment, but noted some procedural errors in their lab notebook. If the following observations were listed in the lab notebook, how would they affect the calculated sodium hypochlorite percentage? Would the calculated percentage be too high, too low, or unchanged by their procedural error?
A. A student forced the remaining liquid in the pipet out with the pipet pump.
B. A student had an air bubble in the buret tip that remained there during the entire titration.
C. A student had an air bubble in the buret tip that came out during the titration.

Question

A student rushed through this experiment, but noted some procedural errors in their lab notebook. If the following observations were listed in the lab notebook, how would they affect the calculated sodium hypochlorite percentage? Would the calculated percentage be too high, too low, or unchanged by their procedural error?
A. A student forced the remaining liquid in the pipet out with the pipet pump.
B. A student had an air bubble in the buret tip that remained there during the entire titration.
C. A student had an air bubble in the buret tip that came out during the titration.

jaredstone4 · Answer

Background on the lab: The experiment was a redox titration involving commercial bleach. The titration mixture of potassium iodate, potassium iodide, and sulfuric acid was titrated with sodium thiosulfate.

jaredstone4 · Answer

I guessed a) and c) too low and b) unchanged but I am quite confused. Any help is appreciated.