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3343 Test 1 Fall 2003 (1)

# 3343 Test 1 Fall 2003 (1) - What is the 95 Confidence Level...

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Chem 3343 Test 1 Fall 2003 NAME 1. If sea water has a chloride concentration of 1.90 x 10 4 ppm, what is its formal (molar) concentration? 2. How would you prepare 1.50 L of a 0.300 F (M) HCl solution from a stock solution that is 36.5% HCl with a specific gravity of 1.185? 3. Calculate y ± S y for y = (243 ± 1)/((6.75 ± 0.3) + (0.843 ± 0.001)) 4. If pH = 5.1 ± 0.2 what is [H + ± s H+ ]? (equation for y = log a is s y = 0.434 s a /a) 5. If [NTA] (nitrilotriacetic acid) in Ohio River water is found to be: Exp ppb NTA 1 38, 37, 38 2 25, 29, 23, 29, 26 What is the pooled value of “s” for the method? 6. A fluoride analysis on a well water sample gave 0.89, 0.96, 0.87, 0.94 ppb F
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Unformatted text preview: -. What is the 95% Confidence Level for the mean of this analysis? 7. A copper standard with a 1.26% Cu concentration gave a 1.32% Cu concentration for 4 measurements. If s → σ for the method = 0.04% does a significant difference exist at the 95% confidence level. Is there any evidence of a determinant error in the analysis? Explain briefly. 8. Before running an analysis on most solid samples the solids have to be dried. What are the principle problems with drying samples and what is the operational solution in most cases (For the latter answer assume that analyses have been performed earlier on these types of samples)....
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