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2010-02-17 - Problem Set _8 - The Nature of Acids and Bases

2010-02-17 - Problem Set _8 - The Nature of Acids and Bases...

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Problem Set #8 The Nature of Acids and Bases 1. Write the formulas for the conjugate acids of (a) CH 3 NH 2 , methylamine (b) NH 2 NH 2 , hydrazine, (c) HCO 3 - and the formulas for the conjugate bases of (d) HCO 3 - , (e) C 6 H 5 OH, phenol, (f) CH 3 COOH 2. Write the proton transfer equilibria for the following acids in aqueous solution and identify the conjugate acid-base pairs in each one: (a) H 2 SO 4 , (b) C 6 H 5 NH 3 + , (c) H 2 PO 4 - , (d) HCOOH, (e) NH 2 NH 3 + . 3. Identify the Brønsted acid and base and the conjugate base and acid formed in the following reaction: HNO 3 (aq) + HPO 4 2- (aq) ↔ NO 3 - (aq) + H 2 PO 4 - (aq) 4. Write the two proton transfer equilibria that demonstrate the amphiprotic character of (a) HCO 3 - , (b) HPO 4 2- . Identify the conjugate acid-base pairs in each equilibrium. 5. Calculate the molarity of OH - in solutions with the following H 3 O + concentrations: (a) 0.020 mol·L -1 (b) 1.0 x 10 -5 mol·L -1 (c) 3.1 x 10 -3 mol·L -1 6. Calculate the pH and pOH of each of the following aqueous solutions of a strong acid or base: (a) 0.0146 M HNO 3 (aq); (b) 0.11 M HCl(aq); (c) 0.0092 M BA(OH) 2 (aq); (d) 2.00 mL of 0.175 M KOH(aq) after dilution to 5.00 x 10
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