A student began his careful titration with an air bubble in the buret tip. The bubble...

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.

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Expert Solution

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

M_A V_A = M_B V_B ,Where M_A molarity of acid, V_A is( volume of acid required to complete the titration+acid containing bubble)

M_B is molarity of base, V_B is the volume of base taken in conical flask

M_B = M_A V_A,, where V_A is increases because of that bubble ,

V_B

Therefore equivalence point of the titration is high compared to the same titration perfomed when bubble is absent
While the p^H of the solution is low because of extra acidic component present in the solution(<7)

queen_honey_blossom answered 1 year ago

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