2. Manual versus Automated Titrations (a) Explain the major advantage of automat

Question

2. Manual versus Automated Titrations (a) Explain the major advantage of automated titration techniques over the manual titrations. A student, when performing the calibration of the drop counter, uses a 20mL beaker instead of a graduated cylinder. Briefly describe the problems, if any, that this student may encounter. (b) 3. Experimental Error: A student began his Part I titration with an air bubble in the tip of the buret. At some moment during the titration the air bubble was released. Briefly describe the effect this would have on the determination of the equivalence point. (a) The bubble was released before the equivalence point. (b) The bubble was released after the equivalence point.

Explanation / Answer

2.

(a) manual tirations may end up addition of excess of titrant into the solution, whereas this error is minimized in case of automated titrations as exact end point are detected here.

(b) Measuring cyllinder is more accurate in measuring volumes than a beaker, therefore error due to incorrect mesured volume will be seen in titration.

(c) If air bubble is present in the buret, this would give higher false value for the ttrant added than actual value. Therefore, the molarity of solution thus calculated will also be greater than the actual value.

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