Hwk 8 Answers - huynh(hph268 – Homework 8 – Sutcliffe...

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Unformatted text preview: huynh (hph268) – Homework 8 – Sutcliffe – (52380) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Name H 3 PO 2 . 1. hypophosphoric acid 2. hydrophosphoric acid 3. perphosphoric acid 4. perphosphorous acid 5. phosphoric acid 6. phosphorous acid 7. hypophosphorous acid correct Explanation: H 3 PO 4 is phosphoric acid. H 3 PO 2 has two fewer oxygens and would therefore be named hypo phosphor ous acid. 002 10.0 points The term strong in strong electrolyte means 1. All of these 2. that the compound is very soluble. 3. that the compound is very concentrated. 4. that the compound ionizes or dissociates completely or almost completely in solution. correct Explanation: To be an electrolyte, the compound must not only be soluble in water, but must also dis- sociate into ions. To be a strong electrolyte, the dissociation should be nearly complete. 003 10.0 points Which one of the following is a water-soluble, weak electrolyte? 1. H 2 CO 3 correct 2. NH 4 ClO 3. Ca(OH) 2 4. H 2 SO 4 5. KBr Explanation: All of the choices are electrolytes, but only carbonic acid (H 2 CO 3 , a weak acid) does not ionize completely, so it is a weak electrolyte. 004 10.0 points How much solute is needed to make 2.50 L of a 4.83 M solution of Ba(NO 3 ) 2 ? Correct answer: 3155 . 2 g. Explanation: [Ba(NO 3 ) 2 ] = 4.83 M V soln = 2.50 L m Ba(NO 3 ) 2 = ? M = mol solute L soln mol solute = 4 . 83 M × 2 . 50 L = 12 . 075 mol n = g solute × 1 mol solute molar mass solute m solute = # of moles × molar mass solute 1 mol solute = 12 . 075 mol Ba(NO 3 ) 2 × 261.3 g 1 mol = 3155 . 2 g Ba(NO 3 ) 2 005 10.0 points We wish to dilute some 18 . 4 M H 2 SO 4 solution to make 600 mL of a 0 . 1 M H 2 SO 4 solution. How much of the 18 . 4 M solution should we start with? 1. 4.00 mL 2. 4.60 mL huynh (hph268) – Homework 8 – Sutcliffe – (52380) 2 3. 3.26 mL correct 4. 1.80 mL 5. 2.70 mL Explanation: M 1 V 1 = M 2 V 2 V 2 = M 2 V 2 M 1 = (0 . 1 M) (600 mL) 18 . 4 M = 3 . 26087 mL 006 10.0 points What are the products of the reaction be- tween bromic acid and potassium hydroxide? 1. KBrO 2 + H 2 O 2. KBrO 2 + H 3 O + 3. KBrO 3 + H 3 O + 4. KBrO 3 + H 2 O correct 5. K 2 BrO 3 + H 2 O 6. K 2 BrO 2 + H 2 O 7. KBrO 3 + OH − Explanation: 007 10.0 points What, if anything, is precipitated when aque- ous solutions of Ba(OH) 2 and MgSO 4 are mixed?...
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This note was uploaded on 06/06/2011 for the course CHEM 301 taught by Professor Wandelt during the Spring '08 term at University of Texas.

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Hwk 8 Answers - huynh(hph268 – Homework 8 – Sutcliffe...

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