Lecture+11 - Polyprotic acids and bases Polyprotic systems...

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Polyprotic acids and bases Polyprotic systems are acids or bases that can donate or accept more than one proton . A molecule that can both donate and accept a proton is said to be amphiprotic .
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(a) How many grams of NaHCO 3 (FM 84.007) must be added to 4.00 g of K 2 CO 3 (FM 138.206) to give a pH of 10.80 in 500 mL of water? (b) What will be the pH if 100 mL of 0.100 M HCl are added to the solution in part (a) ? (c) How many milliliters of 0.320 M HNO 3 should be added to 4.00 g of K 2 CO 3 to give a pH of 10.00 in 250 mL?
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pH in polyprotic acid solutions The Acidic Form, H 2 L + - diprotic acid Example: calculate the pH and composition of individual solutions of 0.050 0 M H 2 L + , 0.050 0 M HL, and 0.050 0 ML .
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Leucine hydrochloride contains the protonated species H 2 L + HL is an even weaker acid, because K 2 = 1.80 × 10 10 .
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Monobasic species We can treat L as a monobasic species, with K b = K b1 . Great approximation!
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Amphiprotic character Solving for H +
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More approximations!
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This note was uploaded on 02/14/2011 for the course SCIENCE 321 taught by Professor Aaa during the Spring '11 term at Windsor.

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Lecture+11 - Polyprotic acids and bases Polyprotic systems...

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