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Title: Chapter 19(1) Started: November 8, 2009 5:18 PM Submitted: November 8, 2009 6:43 PM Time spent: 01:24:48 Total score: 5/12 = 41.67% Total score adjusted by 0.0 Maximum possible score: 12 1. Buffer Synthesis 1 Match the acid/base pair that is suitable for preparing a buffer of each given approximate pH. You will need to refer to Tables in the book of weak acids and bases and polyprotic acid HCOOH/NaHCOO NaH 2 PO 3 /Na 2 HPO 3 HOBr/NaOBr 9 4 7 Statement Response Value Correct Match HCOOH/NaHCOO 4 Correct 4 NaH 2 PO 3 /Na 2 HPO 3 9 Incorrect 7 HOBr/NaOBr 7 Incorrect 9 Score: 0/1 2. Indicator 5 Which indicator would be the best to use for a titration between 0.10 M HF with 0.10 M NaOH? You will probably need to consult the appropriate table in the book. Student Response Value Correct Answer Feedback 1. thymol blue, color change at pH 8-10 100% 2. bromothymol blue, color change at pH 6-8 0% 3. methyl red, color change at pH 3-5 0% 4. alizarin yellow R, color change
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