A 0.1475 M solution of Ba(OH)2 was used to titrate the acetic acid (60.05 g/mol)

Question

A 0.1475 M solution of Ba(OH)2 was used to titrate the acetic acid (60.05 g/mol) in a dilute aqueous solution. The following results were obtained: Sample HAc mL Ba(OH)2mL % acetic acid(w/v) 1 50.00 43.17 2 49.50 42.68 3 25.00 21.47 4 50.00 43.33 (a) Calculate the mean w/v percentage of acetic acid in the sample. (b) Calculate the standard deviation for the results. (c) Calculate the 90% confidence interval for the mean. (d) At the 90% confidence level, could any of the results be discarded? (e) Assume that the buret used to measure the acetic acid had a systematic error of - 0.05 mL at all volumes delivered. Calculate the systematic error in the mean result.

Explanation / Answer

take the mean of the values and then find the variance and then from variance sqrt(variance) is the deviation

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