Question

The object of a general chemistry experiment is to determine the amount (in milliliters) of sodium hydroxide (NaOH) solution needed to neutralize 1 gram of a specified acid. This will be an exact amount, but when the experiment is run in the laboratory, variation will occur as the result of experimental error. Three titrations are made using phenolphthalein as an indicator of the neutrality of the solution (pH equals 7 for a neutral solution). The three volumes of NaOH required to attain a pH of 7 in each of the three titrations are as follows: 82.14, 75.76, and 75.39 milliliters. Use a 99% confidence interval to estimate the mean number of milliliters required to neutralize 1 gram of the acid. (Round your answers to three decimal places.)

______ mL to _______mL

Answer 1

Date: 12/05/2019 Answer A 99% confidence interval to estimate the mean number of millilitres required to neutralize 1 gram of the acid is, By using MINITAB, find confidence interval with the help of following steps is: 1) Import the data (Add label to first column cell and enter data in relevant column) 2) Select the Stat and choose the Basic Statistics option 3) Select the 1 sample t and select Samples in Columns. 4) Click option button choose level of significance and alternative hypothesis 5) Click Ok. One-Sample T: pH Variable NMearn pH StDev SE Mean 99% CI 3 77.7633 3.79482.1909 (56.0186, 99.5081) From the MINITAB output, a 99% confidence interval to estimate the mean number of millilitres required to neutralize 1 gram ofthe acid is 56.019 to 99.508