1422-hw06-acids-bases2-2009

1422-hw06-acids-bases2-2009 - CHEM 1422 - Homework # 6...

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CHEM 1422 - Homework # 6 Name: ___________________________ Acids & Bases # 2 Signature: _______________________ Due Tuesday, April 14, 2009 Group Name: ____________________ 1. (5 pts) 250 mL of 0.2 M acetic acid (HOAc) reacts with 250 mL of 0.2 M NaOH. What is the pH of the resulting solution? pK a (HOAc) = 5 2. (5 pts) Identify whether the following 1:1 solutions will be acidic , basic , or neutral : a) NaOAc/HOAc (pK a = 4.7) b) NH 3 /NH 4 NO 3 (pK a = 9.3) c) NaCl/KNO 3 d) H 3 PO 4 /NaH 2 PO 4 (pK a = 2.1) e) CH 3 NH 2 /CH 3 NH 3 Cl (pK a = 10.6) Table 1. Indicators Name pK a Acid color Base Color Name pK a Acid color Base Color Methyl violet 1 yellow violet bromthymol blue 7 yellow blue methyl yellow 1.7 red yellow thymol blue 8.8 yellow blue methyl orange 3.5 red yellow phenolphthalein 9 colorless pink methyl red 5 red yellow Alizarin yellow 11 yellow red 3. (3 pts) What is the approximate pH of a colorless solution that turns yellow if a small amount of methyl yellow, or alizarin yellow is added to it, but turns
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This note was uploaded on 11/12/2011 for the course CHEM 1422 taught by Professor Staff during the Fall '08 term at LSU.

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1422-hw06-acids-bases2-2009 - CHEM 1422 - Homework # 6...

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