CW14-LEW - Acids Bases A/B Reaction Example HAc NH 3 •...

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CHM 2046/Myers Class Worksheet 14 February 10, 2010 1. Design a Buffer to set the pH = 3.50. ( Buffers are important as a means of setting a pH and then holding this reasonably constant. (a) Select a CA/CB pair with a pKa in the range of 3 to 4. Use ____________ and _____________, with pKa = _____________ (b) Calculate the [CA]/[CB] ratio needed to obtain the specified pH. [CA]/[CB] = ____________ (c) We shall use 100. mL of 0.10 M ________ (the CA). What volume of 0.10 M __________ (the CB) should be used? V B = ____________ 2. Lewis Definitions of Acids and Bases (a new way of thinking).
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Unformatted text preview: Acids: Bases A/B Reaction: Example: HAc + NH 3 • The Lewis conception of acids and bases is “more general.” Many more types of reaction (besides just proton transfer) will now be called Acid-Base. • In proton transfer reactions, the H + is considered to be the acid (not the whole donor such as HAc or H 3 O + ). 3. Graphing [H 3 O + ] and pH for a Titration of a Weak Acid (HAc, in the beaker) with a Strong Base (OH-, in the buret). As a preliminary to doing this we shall work some reacting mixture problems:...
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This note was uploaded on 09/19/2011 for the course CHM 2051 taught by Professor Staff during the Spring '08 term at University of Florida.

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CW14-LEW - Acids Bases A/B Reaction Example HAc NH 3 •...

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