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13 Dec 2019

Describe and explain the possible effect on your results of the following experimental errors or variations. In each case, specify the components whose percentages would be too high or too low. (d) instead of using pH paper, you neutralized the NaHCO3 solution to pH of 7 using litmus paper.

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Describe and explain the possible effect on your results of the following experimental errors or variations. In each case specify the component(s) whose percentage(s) would be too high or too low. (a) After adding the dichloromethane to Panecetin, you didn't stir the mixture long enough. (b) During the NaOH extraction, you failed to mix the aqueous and organic layers thoroughly. (c) You mistakenly extracted the dicholormethane solution with 1 M HCl rather than 1 M NaOH. (d) Instead of using pH paper, you neutralized the NaOH solution to pH 7 using litmus paper.

Describe and explain the possible effect on your TLC results of the following experimental errors or variations:

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1. What effect would the following errors have on the calculated value of Ka? Choose

whether the calculated value would be too high, too low, or if there is no effect. Explain your

Answer.

a. The pH meter was improperly calibrated, so that the pH readings on the instrument

were 0.3 pH units too low.

A. pKa would be too low and Ka would be too high

B. pKa would be too high and Ka would be too low

C. neither would change

D. none of these

Explanation:

b. An endpoint/equivalence point was erroneously read as 27.20 mL whereas the reading

was actually 26.80 mL.

A. pKa would be too low and Ka would be too high

B. pKa would be too high and Ka would be too low

C. neither would change

D. none of these

Explanation:

c. In Step 2, instead of adding 75 mL of water, 150 mL of water was added.

A. pKa would be too low and Ka would be too high

B. pKa would be too high and Ka would be too low

C. neither would change

D. none of these

Explanation:

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Describe and explain the possible effect on your results of the following experimental errors or variations. In each case, specify the components whose percentages would be too high or too low. (d) instead of using pH paper, you neutralized the NaHCO3 solution to pH of 7 using litmus paper.

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