In: Chemistry
A student began his careful titration with an air bubble in the buret tip. The bubble was released, unnoticed, before reaching the equivalence point on the titration curve.
a) Predict the effect on the measured volume of NaOH added to reach the equivalence point.
b) Predict the effect on the measured equivalence point pH value.
During the begining of a titration to standardize the NaOH solution,that student adjusted very carefully the initial burette volume to 0.00 ml,but he was not able to notice an air bubble in the tip of the burette.
At the end of the titration the bubble is gone,whihc means the volume measured is the volume of the titration + volume of bubble i.e its too large
Let us take an example of acid(standardised) vs base titration .The titrant (acid) is taken in a burette ,while base taken in a conical flask.Because of the presence of bubble at the tip ,extra amount of acid is entered in to the conical flask
According to the formulae
MA VA = MB VB ,Where MA molarity of acid, VA is( volume of acid required to complete the titration+acid containing bubble)
MB is molarity of base, VB is the volume of base taken in conical flask
MB = MA VA,, where VA is increases because of that bubble ,
VB