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Quiz 4 - Version 474 – Quiz 4 – Laude –(52455 1 This...

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Unformatted text preview: Version 474 – Quiz 4 – Laude – (52455) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 5.0 points What would be the pH of a 1 M solution of NaHCO 3 ? Assume H 2 CO 3 has a p K a 1 of 3.6 and a p K a 2 of 10.4. 1. 6.8 2. 7 correct 3. 3.6 4. 14 5. 10.4 6. 3.4 Explanation: For a solution composed of a single ampho- teric species (HCO 3- ), pH = 0 . 5(p K a 2 + p K a 3 ) = 0 . 5(3 . 6 + 10 . 4) = 7 002 5.0 points You are asked to determine the concentra- tion of equilibrium species when ammonium hypochlorite (NH 4 ClO) is dissolved in water. How many simultaneous equations will you need to create to solve for all the species in solution? What is the sum of the coefficients for the charge balance equation for the solu- tion? How many different species are formed in the mass balance equation for ammonium?...
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Quiz 4 - Version 474 – Quiz 4 – Laude –(52455 1 This...

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