A student rushed through this experiment, but noted some procedural errors in th

Question

A student rushed through this experiment, but noted some procedural errors in their lab notebook. If the following observations bere 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.

Explanation / Answer

Answers:

A. Calculated sodium hypochlorite percentage will be higher because of the addition of excess volume of liquid.

B. Calculated sodium hypochlorite percentage will be unchanged because of the air bubble in the buret tip that remained there during the entire titration. Since this causes no difference in volume of added liquid.

C. Calculated sodium hypochlorite percentage will be lower because the air bubble in the buret tip came out during the titration. This causes the addition of liquid lesser than calculated due to air bubble coming out of the buret tip.   

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.