please, help me.. i think i know the answers, but i just want to make sure! i'd love your feed back :)

1) an air bubble is trapped in the tip of a buret before a titration. during the titration, the bubble is passed from the buret tip. will the reported volume of titrant used be too high,too low, or unchanged as a result?

--> i think it will be too high because you're including the volume of the bubble (gas) too.

2) in the determination of H2O2 by titration with permanganate, the end point was overshot (too much titrant to analyte)what effect would this have on the reported amount of H2O2? Explain.

--> this one i'm not actually sure how to go about this. i think that the reported amount of H2O2 would be greater than it actually is, but i'm not sure.

(a) is correct and the reasoning is correct.

(b) Without balancing any of the equations, let me just sketch it out.
H2O2 + MnO4^- ==> Mn^+2 + O2
The calculation follows and I have numbered each equation.
1)moles MnO4^- = M x L
2)moles MnO4^- x factor = moles H2O2.
3)grams H2O2 = moles H2O2 x molar mass H2O2.
4)%H2O2 = (grams H2O2/weight sample)*100 = ??

If the endpoint is overshot, then mL MnO4^- is too high so moles in 1) is too high.
moles MnO4^- in 1) makes moles H2O2 in 2) too high.
moles H2O2 in 2) too high makes grams H2O2 in 3) too high and grams H2O2 in 3 (and4) makes %H2O2 too high. So your gut feeling is right but this shows you how to do these. The easy way on any of the too high, too low, the same problem(s) is to write the equation(s) needed to calculate the final answer, then go through each one as I've done. It's all very logical.

you're so wonderful! you're right, i'll use the equations from now on. thank you for enlightening me!

1) You are correct! If an air bubble is trapped in the tip of a buret before a titration, and during the titration, the bubble is passed from the buret tip, the reported volume of titrant used will be too high. This is because the volume of the bubble is being included in the total volume of titrant used, leading to an overestimation of the titration.

2) When the end point of a titration is overshot, meaning that too much titrant is added to the analyte, it will result in a higher reported amount of H2O2 than the actual amount. This is because the end point is the point at which the reaction between the titrant and the analyte is complete. If extra titrant is added beyond the end point, it means that there is an excess of titrant reacting with the analyte. Consequently, the reported amount of H2O2 will be greater than the actual amount present.

Great! Let's analyze your answers and provide feedback:

1) Regarding the air bubble trapped in the buret before titration, you correctly stated that the reported volume of titrant used will be too high. This is because the volume of the air bubble is mistakenly included in the measured volume of the titrant. Therefore, it is important to ensure that there are no trapped bubbles in the buret before conducting the titration.

2) In the case of overshooting the end point during the titration of H2O2 with permanganate, the reported amount of H2O2 would actually be lower than it actually is, not greater. This is because overshooting the end point means that more titrant (permanganate) was added than necessary to react with the analyte (H2O2). As a result, the reported amount of H2O2 will be lower because the excess titrant has reacted with other substances instead of reacting with the intended analyte.

In summary, your answer to the first question is correct, and for the second question, the reported amount of H2O2 would be lower, not greater. It is important to be cautious when interpreting the effects of experimental errors in titrations.