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Suppose a change (an error, if you like) was made in the procedure of the experiment. We would to know qualitatively, (higher than the correct value, lower than the correct value, or no change) how this change would affect the calculated hydroxide ion concentration. A suggested method for determining and explaining the answer was given in experiment 7 and is repeated here for one such change, with only the final conclusion missing. Fill it in. For the second change, you do the whole analysis. Change 1 – The endpoint was overshot (too much titrant was added). Quantity Measured value (what actually happened) “True” value (what should have happened) (Compared to true value) measured value is Why? Initial burette reading Correct Beginning of titration was ok. Final burette reading 31 mL, say 30 mL, say Too high VNaOH Too high so change in the same direction. Correct Pipetting was ok. Correct Too _________ The numerator is correct; the denominator too high. Change 2 – When pipetting the HCl solution, instead of just touching the tip to the surfaceof the liquid, you forcibly expelled the last bit of solution in the pipette.

Suppose a change (an error, if you like) was made in the procedure of the experiment. We would to know qualitatively, (higher than the correct value, lower than the correct value, or no change) how this change would affect the calculated hydroxide ion concentration. A suggested method for determining and explaining the answer was given in experiment 7 and is repeated here for one such change, with only the final conclusion missing. Fill it in. For the second change, you do the whole analysis. Change 1 – The endpoint was overshot (too much titrant was added). Quantity Measured value (what actually happened) “True” value (what should have happened) (Compared to true value) measured value is Why? Initial burette reading Correct Beginning of titration was ok. Final burette reading 31 mL, say 30 mL, say Too high VNaOH Too high so change in the same direction. Correct Pipetting was ok. Correct Too _________ The numerator is correct; the denominator too high. Change 2 – When pipetting the HCl solution, instead of just touching the tip to the surfaceof the liquid, you forcibly expelled the last bit of solution in the pipette.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Suppose a change (an error, if you like) was made in the procedure of the experiment. We would to know qualitatively, (higher than the correct value, lower than the correct value, or no change) how this change would affect the calculated hydroxide ion concentration. A suggested method for determining and explaining the answer was given in experiment 7 and is repeated here for one such change, with only the final conclusion missing. Fill it in. For the second change, you do the whole analysis. Change 1 – The endpoint was overshot (too much titrant was added). Quantity Measured value (what actually happened) “True” value (what should have happened) (Compared to true value) measured value is Why? Initial burette reading Correct Beginning of titration was ok. Final burette reading 31 mL, say 30 mL, say Too high VNaOH Too high so change in the same direction. Correct Pipetting was ok. Correct Too _________ The numerator is correct; the denominator too high. Change 2 – When pipetting the HCl solution, instead of just touching the tip to the surfaceof the liquid, you forcibly expelled the last bit of solution in the pipette.
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