a student carried out the experiment but did not follow the directions exacly as
ID: 787938 • Letter: A
Question
a student carried out the experiment but did not follow the directions exacly as written. What effect would the following actions have on the experiment ?
a. The student took a sample of the vinegar with a 5ml voluetric pipet and then emptied all the liqui into an Erlenmeyer flask by blowing out the sample.???
b. Air was not excluded from the buret when it was filled NaOH solution. An initial buret reading was taken then during the titration, the air bubble came out. When the titration reached the end point, a final reading was taken .???
c. The titration went to a purple end point.???
Explanation / Answer
a)
precise delivery of specific volume of solution will get changed due to an last drop in the pipette, which is not suposed to blow out.
b) Since was not excluded from the burret, so prcise volume will get changed, and you will get falsy value of stregth of acid
c)
At the end point , it should have pale pink, but the solution changes to deep purple means extra volume of NAOH has been added to the solution.
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