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Unformatted text preview: spano velasco (ds28282) – hw05 – Fakhreddine – (52395) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0 points I found some ammonium nitrate sitting in a can. I mixed it with some water I had sitting in a pan. It really mixed up nicely, I thought that I would say the solution was ? on this lovely day. 1. now acidic correct 2. still neutral 3. now just basic Explanation: Ammonium nitrate is the salt of a weak base and is therefore an ACIDIC salt. 002 1.0 points I found some potassium chlorate from inside our lab. I measured some out on a big marble slab. I dissolved it in water, and took a breath of fresh air. The pH No big surprise there. 1. was acidic. 2. remained neutral. correct 3. was now basic. Explanation: Potassium chlorate is the salt of a strong acid and strong base and is therefore a NEU- TRAL salt. 003 1.0 points The term “ K a for the ammonium ion” de- scribes the equilibrium constant for which of the following reactions? 1. NH + 4 + H 2 O ⇀ ↽ NH 3 + H 3 O + correct 2. The term is misleading, because the am- monium ion is not an acid. 3. NH 4 Cl(solid) + H 2 O ⇀ ↽ NH + 4 + Cl- 4. NH + 4 + OH- ⇀ ↽ NH 3 + H 2 O 5. NH 3 + H 3 O + ⇀ ↽ NH + 4 + H 2 O 6. NH 3 + H 2 O ⇀ ↽ NH 4 + + OH- Explanation: 004 1.0 points The generic equation Base- + H 2 O → HBase + OH- can be used to account for the pH of which salt? 1. KClO 3 2. NaHCOO correct 3. NH 3 4. BaBr 2 5. ZnCl 2 Explanation: This hydrolysis equation applies only to anions from weak acids. HClO 3 , HBr and HCl are strong acids. NH 3 is a weak base....
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This note was uploaded on 04/08/2009 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.
- Spring '07