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# CW12-RxM - pH pH = 2 Buffers A buffer is a mixture of a WA...

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CHM 2046/Myers Class Worksheet 12 February 8, 2010 1. A Reacting Mixture – Limiting Reactant Problem: A solution is formed by mixing 300. mL of 0.25 M HCl and 200. mL of 0.25 M NaAc. After reaction to completion, what species are present in “appreciable” ( 0.01 M) concentration. (a) First determine what is present After Mixing, Before Reaction . [H 3 O + ] = [Cl - ] = ______________ [Na + ]= [Ac - ] = ________________ (b) What is the net ionic equation for the principal (large shift) reaction? Determine the principal specie concentrations After Reaction To Completion . [ _______ ] = ________________ [ ______ ] = ______________ [ _______ ] = _________________ [ ______ ] = ______________ (c) What is the final solution

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Unformatted text preview: pH ? pH = ______________ 2. Buffers. A buffer is a mixture of a WA and a WB (usually a CA/CB pair), both in “appreciable” concentration (greater than 0.01 M). (a) There is a shortcut formula for buffers: HA + H 2 O H 3 O + + A-(b) In general, for any buffer, if [CA] = [CB], then pH = _________. If 10 ≥ ] CB [ ] CA [ ≥ 0.1, then pH = ____________ (c) Sample Buffer Problem: A solution has [HAc] = 0.25 M and [Na + ] = [Ac-] = 0.10 M. What is the pH of this solution? pH = ______________ 3. Graphing [H 3 O + ] and pH for a Titration of a Strong Acid (H 3 O + , in the beaker) with a Strong Base (OH-, in the buret)....
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