The German company Surig sells Essigessenz, which is reported to be 30% acetic acid by mass vinegar. You are asked to test a sample to determine if, in fact, it is 30% acetic acid by mass. You weigh out a 10.00mL sample of the vinegar and find it has a mass of 10.261g. You then add 20mL of water and a drop of phenolphthalein to the sample. You prepare a buret with 1.145M NaOH solution. It has an initial volume of 1.31mL. The vinegar sample is titrated to the phenolphthalein endpoint. The final volume on the buret is 47.59mL. What is the percent by mass acetic acid in the vinegar sample? Report your answer to 4 significant figures. Your Answer:

The German company Surig sells Essigessenz, which is reported to be 30% acetic acid by mass vinegar. You are asked to test a sample to determine if, in fact, it is 30% acetic acid by mass. You weigh out a 10.00mL sample of the vinegar and find it has a mass of 10.261g. You then add 20mL of water and a drop of phenolphthalein to the sample. You prepare a buret with 1.145M NaOH solution. It has an initial volume of 1.31mL. The vinegar sample is titrated to the phenolphthalein endpoint. The final volume on the buret is 47.59mL. What is the percent by mass acetic acid in the vinegar sample? Report your answer to 4 significant figures. Your Answer:

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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Question

H8.

The German company Surig sells Essigessenz, which is reported to be 30% acetic
acid by mass vinegar. You are asked to test a sample to determine if, in fact, it is
30% acetic acid by mass.
You weigh out a 10.00mL sample of the vinegar and find it has a mass of 10.261g.
You then add 20mL of water and a drop of phenolphthalein to the sample. You
prepare a buret with 1.145M NaOH solution. It has an initial volume of 1.31mL. The
vinegar sample is titrated to the phenolphthalein endpoint. The final volume on the
buret is 47.59mL. What is the percent by mass acetic acid in the vinegar sample?
Report your answer to 4 significant figures.
Your Answer:
Answer

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Q5. As part of the aspirin synthesis lab, the orgo students also had to perform the following calculation to demonstrate their knowledge. Are you able to help them work this out? Saponification is a process in which soap is produced from the chemical reaction between animal fat (triglycerides) and a strong base such as KOH. An example of such a balanced chemical reaction is shown here: C51H98O6 + 3KOH à C3H5(OH)3 + 3C16H31O2K Triglyceride Soap If, during the saponification reaction, 231.5 g of C51H98O6 is mixed with 231.5 g of KOH and 160 g of soap is produced: Calculate the theoretical yield of soap (in grams), C16H31O2K, and indicate which species is the limiting reactant. Provide your answer to 2 decimal places (5). Calculate the percent yield for this reaction. Provide your answer to 1 decimal place (1). Show ALL steps and equations involved in your calculations. Remember to label all steps clearly and use appropriate units.
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