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S06Practice - Practice Problems for Concepts Chemical...

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Practice Problems for Concepts Chemical Equilibrium through Nuclear Chemistry 1. The following reaction is at equilibrium: 4NH 3 (g) + 3O 2 (g) ↔ 6H 2 O (g) + 2N 2 (g) How will the equilibrium shift if: a. The volume is increased b. Four moles of Helium gas is added c. A lit match is placed inside the container 2. This equation is at equilibrium: CO (g) + H 2 O (g) ↔ CO 2 (g) + H 2 (g) a. If a 10.00L vessel has 2.50 mol CO 2 and H 2 O, and 5.00 mol CO 2 and H 2 gas at 588 ° K, which way will the reaction proceed? (K c = 31.4 at 588 ° K) b. What are the concentrations of all species at equilibrium? 3. What is the pH of a solution containing 50.0mL of 1.00M HCl and 100.0mL of 0.25M HCl? 4. What is the pH of a 1.75M NH 3 solution when it has reached equilibrium? (K B =1.8x10 -5 ) 5. What is the general pH of water when the following salts are added? a. FeCl 2 b. NaCl c. NaCH 3 CO 2 6. After an all-night drinking binge, an MSU student pukes 300.0mL of liquid into his trash can. Assuming the puke is 20% HCl and the rest does not affects the pH, what is the pH of the solution resulting from the puke being neutralized with 0.50M NH 3 ? (K B =1.8x10 -5 ) 7. What is the pH of a buffer with 0.75 mol Hypochlorous Acid and 0.50 mol of its conjugate base in a 200.0mL solution? (K A = 3.5x10 -8 ) 8. 500.0mL of a buffer with pH of 4.50 is required. If the acid is to be 0.80M, what mass of the lithium salt of the conjugate base is needed? Acid Formula K A Value Benzoic C 6 H 5 CO 2 H 6.3x10 -5 Cyanic HOCN 3.5x10 -4 Phenol C 6 H 5 OH 1.3x10 -10
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9. You have a 50.0mL solution of 1.35M NH 3 which you are titrating with a 0.75M solution of HBr a. What is the pH before you start titration? b. What is the pH at the halfway point of titration? c. What is the pH at the equivalence point? d. What is the pH after adding 110.0mL of HBr? 10. The K sp for lead(II) chloride is 1.7x10 -5 . If you place 3.00g of this solid in water, how much solid will be left after the system reaches equilibrium? (Hint: Find the molarity of the disassociated lead ion. It is equal to how much the molarity of the PbCl 2 decreases by since they are in a 1:1 ratio) 11.How much of the above solid will be left if the solid is instead placed in a 0.01M HCl solution? 12.Feeling despair after the last chemistry exam, a Lyman Briggs student decides to instead try and strike it rich by retrieving precious metals from toxic waste water. If the water he is treating contains lead, barium, silver and sodium, what is the best way to obtain the silver and make the water drinkable?
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