H07_ pH curves, Indicators

# H07_ pH curves, Indicators - padilla(tp5647 – H07 pH...

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Unformatted text preview: padilla (tp5647) – H07: pH curves, Indicators – McCord – (53215) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points At the stoichiometric point in the titration of 0.130 M HCOOH(aq) with 0.130 M KOH(aq), 1. the pH is greater than 7. 2. [HCO- 2 ] = 0.130 M. 3. the pH is less than 7. 4. the pH is 7.0. 5. [HCOOH] = 0.0650 M. 002 10.0 points What is the pH at the half-stoichiometric point for the titration of 0.22 M HNO 2 (aq) with 0.01 M KOH(aq)? For HNO 2 , K a = 4 . 3 × 10- 4 . 1. 2.31 2. 3.37 3. 2.16 4. 7.00 5. 2.01 003 10.0 points For the titration of 50.0 mL of 0.020 M aque- ous salicylic acid with 0.020 M KOH(aq), cal- culate the pH after the addition of 55.0 mL of KOH(aq). For salycylic acid, p K a = 2.97. 1. 7.00 2. 12.30 3. 12.02 4. 10.98 5. 11.26 004 10.0 points Consider the titration of 50.0 mL of 0.0200 M HClO(aq) with 0.100 M NaOH(aq). What is the formula of the main species in the solution after the addition of 10.0 mL of base? 1. ClO- 2. HClO 2 3. NaOH 4. ClO 2 5. ClOH 005 10.0 points You have a solution that is buffered at pH = 2.0 using H 3 PO 4 and H 2 PO- 4 (p K a1 = 2 . 12; p K a2 = 7 . 21; p K a3 = 12 . 68). You decide to titrate this buffer with a strong base. 15.0 mL are needed to reach the first equivalence point.are needed to reach the first equivalence point....
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H07_ pH curves, Indicators - padilla(tp5647 – H07 pH...

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