A group of students titrate a calcium carbonate standard solution repeatedly in five experimentaltrials. Based on the five trials, the group determines that the average concentration of the standardis 80.5 ppm with a standard deviation of 0.5 ppm. Using the equation for the Student's t confidenceinterval found in Appendix 1 of your lab manual and the t-value for a 95% confidence interval,calculate the confidence interval for which there is a 95% chance of finding the "true value" ofthe standard solution's concentration based on the data. Put your answer in the format # lowerlimit < "true value" < # upper limit. (Appendix 2 has an example that may be helpful.)

Average concentration = 80.5 ppm Standard deviation = 0.5 ppm Confidence interval = 95% Number of…

Answered: A group of students titrate a calcium…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.18QAP

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[References) A method for the determination of the corticosteroid methylprednisolone acetate in solutions obtained from pharmaceutical preparations yielded a mean value of 3.7 mg mL with a standard deviation of 0.3 mg mL. For quality control purposes, the relative uncertainty in the concentration should be no more than 3%. How many samples of each batch should be analyzed to ensure that the relative standard deviation does not exceed 9% at the 95% confidence level? samples
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