Hwk 8 Answers - huynh(hph268 Homework 8 Sutclie(52380 This...

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huynh (hph268) – Homework 8 – Sutclife – (52380) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore 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 ±ewer oxygens and would there±ore be named hypo phosphor ous acid. 002 10.0 points The term strong in strong electrolyte means 1. All o± 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 o± the ±ollowing 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 o± 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 o± a 4.83 M solution o± 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 = # o± 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 o± a 0 . 1 M H 2 SO 4 solution. How much o± the 18 . 4 M solution should we start with? 1. 4.00 mL 2. 4.60 mL
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huynh (hph268) – Homework 8 – Sutclife – (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? 1. only Mg(OH) 2 2. only BaSO 4 3. both BaSO 4 and Mg(OH) 2 correct 4. Nothing precipitates.
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Hwk 8 Answers - huynh(hph268 Homework 8 Sutclie(52380 This...

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