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2 Nov 2009 Recitation

2 Nov 2009 Recitation - (a 0 mL(b 10.0 mL(c 40.0 mL(d 80.0...

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Recitation 2 November 2009 1. Sketch a titration curve for a weak acid titrated with a strong base. Identify the following points on the curve. Group Problems a. The equivalence point b. The buffering region c. pH = pKa d. pH depends only on [HA] e. pH depends only on [A - ] f. pH depends only on the amount of excess strong base added. 2. Consider the titration of 50 – mL of 1.0 M benzoic acid with standardized 0.5 M NaOH. (a.) Identify the halfway to the equivalence point, (b.) Identify the equivalence point, and (c.) Calculate the pH at the following points during the titration: i. At the starting point in which no NaOH has been added. ii. After 25 – mL of 0.5 M NaOH has been added. iii. After 50 – mL of 0.5 M NaOH has been added. iv. After 100 – mL of 0.5 M NaOH has been added. v. After 150 – mL of 0.5 M NaOH has been added. The K a for Benzoic Acid is 6.4 x 10 -5 . 3. Consider the titration of 40.0 mL of 0.200 M HClO 4 with 0.100 M KOH. Calculate the pH of the resulting solutions after the following volumes of KOH has been added.
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Unformatted text preview: (a.) 0 mL (b.) 10.0 mL (c.) 40.0 mL (d.) 80.0 mL (e.) 100.0 mL 4. Calculate the molar solubility of each of the following compounds in moles per liter and grams per liter (Ignore any acid-base properties). a. Ag 3 PO 4 (Ksp = 1.8 x 10-18 ) b. CaCO 3 (Ksp = 8.7 x 10-9 ) 5. Calculate the solubility (in mol/L) of Fe(OH) 3 (Ksp = 4.0 x 10-38 ) in each of the following instances. a. Water (pH = 7) b. A buffered solution at pH = 5.0 c. A buffered solution at pH = 11.0 1. Calculate the pH for the titration of a 50-mL solution of 1.0 M pyridine C 5 H 5 N (K b = 1.7 x 10-9 ) with 0.25 M HCl. Individual Problems a. At the starting point with no HCl added. b. After 50 – mL of HCl is added. c. After 100 – mL of HCl is added. d. After 200 – mL of HCl is added e. After 250 – mL of HCl is added Sketch the titration curve. 2. The Ksp for silver sulfate (AgSO 4 ) is 1.2 x 10-5 . Calculate the solubility of silver sulfate in each of the following. a. Water b. 0.10 M AgNO 3 c. 0.20 M K 2 SO 4...
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2 Nov 2009 Recitation - (a 0 mL(b 10.0 mL(c 40.0 mL(d 80.0...

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