Briefly explain whether the following situations will result in a too high or to

Question

Briefly explain whether the following situations will result in a too high or too low determination of acetic acid in the vinegar sample. Student starts titrating while there is an air bubble at die tip of die buret. 2. There are drops of vinegar clinging to die inside of the graduated cylinder after die sample has been transferred into the sample flask. The titration is sloped when the pink color lasts only 10 seconds. Droplets of NaOH are clinging to the inside of the buret after the end point of the titration was reached.

Explanation / Answer

acetic acid is present in vinegar, so it is being titrated by a base....

Q1.

if there is an air bubble in the buret, then there is an INCORRECT measure of volume of base initially

If we add the Real Volume, then we will measure this as

Vbase used < Vbase read

so the concentration will be LOWER,

Macid * Vacid = Mbase * Vbase

Since Vacid is constant, Mbase is constnat, and Vbase is incorrectly measured LOWER, this will appear to have a lower concentration than it is

Q2.

if there are drops of vinegar, the sample, then the actual volume of acid is incorrect

Macid * Vacid = Mbase * Vbase

Is Vacid is incorrect, we are accounting for more, when in reality it is less

this will yield a LOWER concentration

Q3.

Recall tha tthe pink color must REMAIN constant as time passes by, indicating there is plenty of base, and the titration is achieved

If there is a duration of 10 seconds, then the titration is NOT finished

Macid * Vacid = Mbase * Vbase

Vbase is LESS than the real one required to neutralize it. so the Concentration of acid will be LSES

Q4.

NaOH are inside the buret...

This implies there is not enough Volume of base

the concentration will be HIGHER

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