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SCAN0013 - Problems 4& 5 show that while a small volume...

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Unformatted text preview: Problems 4 & 5 show that while a small volume of water will undergo large pH changes upon addition of 0H _ or H 30 +, a properly-prepared bufler system of the same volume will undergo much smaller pH changes upon addition of the same amounts ofOH ’ or H 30 J”. Problem 5 will be worked somewhat like Sample Problem 19.] p. 818-9. Problem 6 uses the Henderson-Hasselbalch equation to answer the same questions as in Problem 5. You might find the Henderson—Hasselbalch equation easier to use in working bufler problems which satisfy the ”5 % ” rule. Use Kw = 1.00 x 10 ‘ ‘4 . \OLC/VSE \WQQ‘ 4a) What is the pH of pure water? VT .. DO MAM Q OVEN "‘ 5) 4b) What is the pH %0 m1 of pure water to which 0.00100 mol of solid NaOH has been added? \1 + ~- ~ ted-:3:- .eotmgg : «01511 M 1011 1901+ «ML 630% whom»: L81"; /pH:\L1¢(1')-»QOH / _. 1 / — \Q\% 5 C) What is the pH of 65.0 ml of pure water to which 0.00100 mol of HCI has been added? HUM \—\2,O-—‘>\—Ke)0* 4 Q0,” XHXY+UK (“30%; :QQA—‘gg—z .Oi'gLEM aOLO 9H: AGEILOXSQB : mad?) (5a) What is e pH ofthe 0.20 M NH3 / 0.20 M NH4C1 buffer system? Kb ofNH3 = 1.8 E — 5. .9M we, cud e QMNUN; CignoM cm NEW“ “to :3- WW t 0H“ 3%: Least 5 x Lawdmfi .a—x .Q-HC 5C fl 6329)” . e: [9%6'3’; X 7:: EDA—3 ' : (3H: 0191.0 m ...
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