HOMEWORK 1 Analytical Chemistry

Analytical chemistry Semester II, 2020-221 HOMEWORK # Due date: 11/3/2021 (30 pts) The solubility product Ksp for the salt AgX is (4.0±0.4)×10-8, and the molar solubility is square root of the Ksp What are the relative and absolute uncertainty in the calculated solubility of AgX? (30 pts.) A chemist obtained the following data for percent lindane in the triplicate analysis of an insecticide preparation: 7.23, 6.95, and 7.53 Calculate the 95% confidence interval for the mean for the three data, assuming that: a the only information about the precision of the method is the precision for the three data b on the basis of long experience with the method, it is believed that s  σ = 0.28% lindane (40 pts.) The homogeneity of chloride level in a water sample from a lake was tested by analyzing portions from the top and from near bottom of the lake, with the following results in ppm Cl Top Bottom 26.30 26.22 26.43 26.32 26.28 26.20 26.19 26.11 26.49 26.42 a (15 pts.) Apply the t-test at 95% confidence level to determine if the chloride level from the top of the lake is different from that at the bottom b (15 pts.) Now use the paired t-test to determine whether there is a significant difference between the top and bottom values at the 95% confidence level Analytical chemistry Semester II, 2020-221 c (10 pts.) Why is a different conclusion drawn from using the paired t-test and the normal t-test for differences in means? ...Analytical chemistry Semester II, 2020-2 21 c (10 pts.) Why is a different conclusion drawn from using the paired t-test and the normal t-test