Post-lab 4-solutions - gonzales (pag757) Post-lab 4 Lyon...

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Unformatted text preview: gonzales (pag757) Post-lab 4 Lyon (52635) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points When an acid and base neutralize each other, the products are generally water 1. a salt. correct 2. a gel. 3. a colloid. 4. an ion. Explanation: The general format for neutralization reac- tions is acid + base salt + water. 002 10.0 points Calculate the amount of KHP in grams that is required to completely neutralize 32.50 ml of 0.580 M potassium hydroxide. Correct answer: 3 . 8496. Explanation: moles KHP = moles KOH grams KHP MW KHP = M KOH V KOH grams KHP = M KOH V KOH MW KHP grams KHP = 3 . 8496 grams Your answer is limited to three significant digits (3.85 grams) by the concentration of KOH. 003 10.0 points Calculate the volume of 1.65 M sulfuric acid in milliliters that is required to completely neu- tralize 50.00 ml of 0.755 M sodium hydroxide. Correct answer: 11 . 4394 mL. Explanation: moles H + = moles OH moles H + = 2 moles H 2 SO 4 moles OH = moles NaOH M H 2 SO 4 V H 2 SO 4 2 = M NaOH V NaOH V H 2 SO 4 = M NaOH V NaOH M H 2 SO 4 2 V H 2 SO 4 = 11 . 4394 mL . Your final answer is limited to three signifi- cant digits (11.4 mL) by the concentrations of H 2 SO 4 and NaOH. 004 10.0 points Calculate the amount of calcium hydroxide in grams that is required to neutralize 1.00 L of 0.850 M phosphoric acid. Show your work. Support your answer by providing the corresponding chemical equation. Correct answer: 94 . 5 grams. Explanation: moles H + = moles OH moles H + = 3 moles H 3 PO 4 moles OH = 2 moles Ca(OH) 2 M H 3 PO 4 V H 3 PO 4 3 = grams Ca(OH) 2 MW Ca(OH) 2 2 Rearrange that equation: grams Ca(OH) 2 = M H 3 PO 4 V H 3 PO 4 3 MW Ca(OH) 2 2 Plug in the values: grams Ca(OH) 2 = . 850 M 1 . 00 L 3 74 . 0926 g / mole 2 grams Ca(OH) 2 = 94 . 4681 grams....
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This note was uploaded on 03/15/2010 for the course CH 52645 taught by Professor Lyon during the Spring '10 term at University of Texas at Austin.

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Post-lab 4-solutions - gonzales (pag757) Post-lab 4 Lyon...

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