practice exam

practice exam - Chem. 150 Midterm Exam July 12, 1999 S....

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Chem. 150 Midterm Exam July 12, 1999 ____________________________________ S. Buratto Name (please print) ____________________________________ P e r m . # problem score 1 2 3 4 5 6 7
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Useful Formulas Henderson-Hasselbalch Equation pH = pK a + log([A - ]/[HA]) Confidence Interval µ = X ± ts/ N p-functions pK = - logK K = 10 -pK logK = 10 K
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1. (15 pts total/3 pts each) Multiple choice. Circle only one answer. i) An aqueous solution at 4°C has a concentration of 1 µ g/L which is equal to: (a) 1 ppm (b) 1 ppb (c) 1% (d) 0.001% ii) The activity of an ion in aqueous solution is always: (a) concentration (b) concentration (c)= concentration iii) Given 0.01 M solution of HNO 3 , the pH is (with appropriate significant figures)? (a) 2 (b) 2.0 (c) 2.00 (d) 2.000 iv) A 0.01 F solution of MgCl 2 will have a Cl - concentration equal to (assuming complete dissociation): (a) 0.10 M (b) 0.01 M (c) 0.02 M (d) 0.005 M v) How many significant figures in pH = 10.60? (a) 3
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practice exam - Chem. 150 Midterm Exam July 12, 1999 S....

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