To help you succeed in this lab, here are some common mistakes and deviations fr
ID: 498430 • Letter: T
Question
To help you succeed in this lab, here are some common mistakes and deviations from the written procedure. Predict how the final result will be affected if each of the following is done (instead of the procedure as written). Here are some hints for hoe to think about these questions. For example, you know that when the student finishes the titration he will subtract the staring reading on the burette from the final reading to get the volume of solution used. Ask yourself, will he actually have dispensed that much reagent, or more or less? If less solution has actually been dispensed than the burette indicated, ask yourself how the final result of the calculation will be affected because the value for the number of mL used in the calculation is too large? If he has dispensed the amount of solution that he has measured, ask yourself il it is, for some reason, too much or too little? For example, what if some solution goes onto the desktop instead of info the titration flask. Then the volume of the solution will be greater than it should be. Ask yourself what the effect will be on the final result if the number of mL for the particular reagent is too large? Imagine putting a too large (or too small) number into the calculations. Ask yourself what does to the calculation? Beware, not all things mentioned will change the results. Pull a check mark (x) in the correct column.Explanation / Answer
(a) Result is OK
(b) Due to dilution of the reagent in the flask with the deionised water used for rinsing, result will be too large.
(c) Result will be too small.
(d)Result will be too big as some amount of acid is not added to the base rather that's wasted.
(e) Due to rinsing the buret with water the acid in the buret will be diluted and strength will be reduced, as a result result will be too large.
(f) result will be too small as less base was reacting with the added acid, so less amount of acid will be required. Remaining base will be still in the wall of the container which isn't pAarticipating in the titration reaction.
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