Redox Titration: Analysis of Bleach Post-Lab Questions (40 Points) 2. A student

Question

Redox Titration: Analysis of Bleach

Post-Lab Questions (40 Points)

2. 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 affected the calculate 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.

Explanation / Answer

Case 1.

In this case, the student has added more volume (excess), so the calculated sodium hypochlorite percentage will be higher

Case 2

In this case there will be no change in sodium hypochlorite percentage, since the air bubble remain stay inside the buret tip during the entire titration.

Case 3

In this case the calculated sodium hypochlorite percentage will be lower. Air bubble came out of the buret, and this cause less addition of liquid from buret than the actual. So, the calculated percentage of sodium hypochlorite will be lower.

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