CHEM 302 HW7 - jrr944 Homework 7 Lyon (53565) This...

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jrr944 – Homework 7 – Lyon – (53565) 1 This print-out should have 24 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. This homework is due Thursday, March 6 by 12:00pm. 001 10.0 points A lake in central Texas contains 1 billion liters oF water. The pH is normally 6.0, but it is tested at 5.0 and the fsh are in danger. How much CaCO 3 should be dumped in to bring the pH back to 6.0? Assume CaCO 3 + H + Ca 2+ + HCO 3 The molecular weight oF CaCO 3 is 100.1 g/mol. 1. 157 g 2. 157 kg 3. 900,000 kg 4. 900 kg 5. 90 kg 002 10.0 points The pH oF 0 . 1 M HClO 2 (chlorous acid) aqueous solution was measured to be 1 . 2. What is the value oF p K a For chlorous acid? 1. 0.96 2. 1.40 3. 1.20 4. 2.57 5. 3.91 6. 0.11 003 10.0 points A solution is prepared by dissolving NaCl in water. The pH oF this solution is closest to 1. 3. 2. 9. 3. 5. 4. 7. 5. 11. 004 10.0 points A 0.28 M solution oF a weak acid is 3.5% ionized. What is the pH oF the solution? 1. 5.25 2. 1.46 3. 0.55 4. 3.17 5. 2.01 005 10.0 points What is the H 3 O + concentration oF a 0.15 M solution oF NH 4 Cl in H 2 O at 25 C? ( K b For NH 3 = 1 . 8 × 10 5 ) 1. 8 . 2 × 10 1 M 2. 1 . 0 × 10 14 M 3. 9 . 1 × 10 6 M 4. 1 . 1 × 10 9 M 5. 1 . 6 × 10 3 M 6. 4 . 9 × 10 5 M 006 10.0 points K a For HClO is 3 . 5 × 10 8 . What is the pH oF a 0.3 M solution oF HClO? You may approximate the Full quadratic For problem because K c is so small. The reaction is HClO + H 2 O H 3 O + + ClO
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jrr944 – Homework 7 – Lyon – (53565) 2 K w = 1 × 10 14 . 1.
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CHEM 302 HW7 - jrr944 Homework 7 Lyon (53565) This...

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