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elizondo (jie268) – Homework 9 – fakhreddine – (51550) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0points Consider an indicator ionized as shown HIn + H 2 O H 3 O + + In - for which K HIn = 1 . 0 × 10 - 4 yellow/red and consider the statements a) The predominant color in its acid range is yellow. b) In the middle of the pH range of its color change a solution containing the indicator probably will be orange. c) At pH = 7.00 a solution containing this indicator (and no other colored species) will be red. d) At pH = 7.00 most of the indicator is not ionized. Which of the responses contains all the true statements and no others? Write the equilib- rium constant expression for the indicator. 1. a and c 2. another combination 3. b and d 4. c and d 5. a, b, and c 002 1.0points The acid form of an indicator is yellow and its anion is blue. The K a of this indicator is 1 × 10 - 5 . What will be the approximate pH range over which this indicator changes color? 1. 4 < pH < 6 2. 9 < pH < 11 3. 5 < pH < 7 4. 3 < pH < 5 5. 8 < pH < 10 003 1.0points Which of the following acid-base indicators should be used for the titration of HNO 3 with KOH? 1. Neutral red, color change red/yellow 6 . 8 < pH < 8 . 0 2. None of these is suitable. 3. Methyl red, color change red/yellow at 4 . 4 < pH < 6 . 2 4. Phenolphthalein, color change colorless/red-violet 8 . 0 < pH < 10 . 0 5. Any of these is suitable. 004 1.0points Which of the following acid-base indicators should be used for the titration of NH 3 with HBr? K b of ammonia is 1.8 × 10 - 5 .
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  • Spring '13
  • fakhreddine
  • pH, ml, elizondo

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