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Students measured the concentration of HCl in a solution by titrating with different
Chapter 4, Problem 4-19(choose chapter or problem)
Students measured the concentration of HCl in a solution by titrating with different indicators to find the end point. Mean HCl concentration (M) Number of Indicator ( standard deviation) measurements 1. Bromothymol blue 0.095 65 0.002 25 28 2. Methyl red 0.086 86 0.000 98 18 3. Bromocresol green 0.086 41 0.001 13 29 SOURCE: D. T. Harvey, J. Chem. Ed. 1991, 68, 329. Is the difference between indicators 1 and 2 significant at the 95% confidence level? Answer the same question for indicators 2 and 3.
Questions & Answers
QUESTION:
Students measured the concentration of HCl in a solution by titrating with different indicators to find the end point. Mean HCl concentration (M) Number of Indicator ( standard deviation) measurements 1. Bromothymol blue 0.095 65 0.002 25 28 2. Methyl red 0.086 86 0.000 98 18 3. Bromocresol green 0.086 41 0.001 13 29 SOURCE: D. T. Harvey, J. Chem. Ed. 1991, 68, 329. Is the difference between indicators 1 and 2 significant at the 95% confidence level? Answer the same question for indicators 2 and 3.
ANSWER:The difference between indicators 1 and 2 is not significant at the 95% confidence level becaus