HMWK 1 - C211 FALL 2015 Homework 1 Name Due Friday...

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C211 FALL 2015 Homework 1 Name ______________________________ Due Friday September 4, by 3 pm. 12 pts total, 1 point each question. No late papers accepted. 1. In Mecca during the recent annual Hajj, carbon monoxide levels in traffic tunnels peaked at 57,400 ppb by volume. Assuming ambient pressure ~ 1.00 atm, and T = 41.5 o C what mass of CO is in 1.00-L of the air, as micrograms? Mass of CO per L= Show units! 2. Calculate the molarity of a 45.00 % (wt/wt) solution of sulfuric acid (H 2 SO 4 ). Assume 20 o C and the density of the solution is 1.3476 g/mL. Conc of the acid = Show units! 3. Calculate the mass in mg of the following solutes: (a) 656 mL of a solution containing 4.96 ppm of Pb(NO 3 ) 2 . (1 ppm ≈ 1 mg/L) (b) 6.75 mL of a 0.0619 M KNO 3 solution (c) 21.7 mL of 0.0125 M KBrO 3 (d) 18.2 mL of 4.75 x 10 −3 M NaBr
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4. (a) What is the pH of a solution having [H+] = 5.6 x 10 −4 M? (b) What is the pH of a solution having [OH-] = 4.21 x 10 −3 M? (c) What is the hydronium ion concentration when pH = 8.70? (d) If pNa = 3.35, what is [Na+]? 5. List some errors that might arise when sampling a lake to analyze for heavy metal contamination. (5 non-redundant answers required for full credit)
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