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Post-lab 2-solutions

# Post-lab 2-solutions - gonzales(pag757 Post-lab 2...

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gonzales (pag757) – Post-lab 2 – Lyon – (52635) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. This post-lab 2 assignment is due by 8AM on your next lecture day. The questions cover experiment 2. 001 10.0 points Using the Q-test, determine whether there is an outlier in the following data set: 0.8543, 0.8614, 0.8573, 0.8600, 0.8419, 0.8607, and 0.8599. Discard the outlier if there is one, and then calculate the average and standard deviation to the correct number of significant figures. How would you report your results? 1. 0.857 ± 0.003 2. 0.8565 ± 0.00266 3. 0.859 ± 0.003 correct 4. 0.85568 ± 0.00266 Explanation: 0.8419 is separated from the other values, and its nearest neighbor is 0.8543. Calculat- ing Q according to the formula in Appendix 1 gives 0.66. There are 7 data points, so n=7. Since Q > 0.51 from the Q-table, the 0.8419 data point should be thrown out. The average of the remaining points is 0.85893. The standard deviation of those data points is 0.00266. Round the standard deviation to one significant digit (0.003) and round the average to that same decimal place (the thou- sandths place). 002 (part 1 of 2) 10.0 points Barium chloride, BaCl 2 , is soluble in water but is not reactive towards 3.0 M nitric acid. Barium sulfate, BaSO 4 , is not soluble in wa- ter and does not react with 3.0 M nitric acid. Barium phosphate, Ba 3 (PO 4 ) 2 , is reactive to- wards 3.0 M nitric acid but is not soluble in water. a) Suppose you have a solid mixture of barium sulfate and barium phosphate. Which of the following schemes would recover barium sulfate as pure solid out of the mixture?

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