s11Q1W2 - CHEM 0120 Golde SPRING 2011 QUIZ 1 WEEK 2 Monday...

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CHEM 0120 SPRING 2011 Monday 1:00 PM Golde QUIZ 1 WEEK 2 January 10, 2011 Name_______________________________ Show your work or give your reasoning in each question. 1. What volume of 0.150 M Na 2 CO 3 solution can be prepared by dilution with water of 285 mL of a 4.85 M stock solution of Na 2 CO 3 ? 2. Put the following numbers in the ordering of increasing value, smallest number first: 2 x 10 -3 , 3 1 2 x 10 - , 200 3. Consider the reaction: 2 NH 3 (aq) + H 2 SO 4 (aq) (NH 4 ) 2 SO 4 (aq) a) Assign each species as a strong or weak acid or as a strong or weak base or as an ionic compound. b) Write the net ionic equation for this reaction. ANSWERS 1. The number of moles of Na 2 CO 3 remains constant during dilution. # mol Na 2 CO 3 = 0.285 L x L 1 mol 85 . 4 = 1.38 mol Vol. of dilute solution = 1.38 mol x 1 L 0.150 mol = 9.21 L 2. 3 1 2 x 10 - = 500, so 2 x 10 -3 < 200 < 3 1 2 x 10 - 3. a) NH 3 : weak base; H 2 SO 4 : strong acid; (NH 4 ) 2 SO 4 : ionic compound. b) 2 NH 3 (aq) + 2 H + (aq) 2 NH 4 + (aq) OR NH 3 (aq) + H + (aq) NH 4 + (aq) CHEM 0120 SPRING 2011 Monday 6:00 PM Golde QUIZ 1 WEEK 2 January 10, 2011 For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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Name_______________________________ Show your work or give your reasoning in each question. 1. Which of the following statements is/are correct for a 0.735M solution of calcium nitrate, Ca(NO 3 ) 2 ? Give your reasoning for each response. Give a correct version of any incorrect statement. a) 0.735L of this solution contain 1.00mol of Ca(NO 3 ) 2 . b) The molarity of the nitrate ions is twice the molarity of the calcium ions for this solution. 2. (a) What is the conjugate base of nitrous acid, HNO 2 ? What is the conjugate acid of H 2 O? (b) Draw a Lewis structure for HNO 2 and for its conjugate base. (c) Write a balanced equation for the Bronsted-Lowry "ionization" reaction of the acid HNO 2 with H 2 O. ANSWERS 1. a) False. It should read: 1.00L contains 0.735mol of Ca(NO 3 ) 2 . b) Correct. Each mole of the compound splits into 1 mol of Ca 2+ ions and 2 mol of NO 3 - ions. 2. a) NO 2 - ; H 3 O + b) H O N O O N O [ ] - c) HNO 2 + H 2 O H 3 O + + NO 2 - CHEM 0120 SPRING 2011 Tuesday 8:00 AM Golde QUIZ 1 WEEK 2 January 11, 2011 Name_______________________________ For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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Show your work or give your reasoning in each question. 1.
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This note was uploaded on 02/20/2011 for the course CHEM 110 taught by Professor Dr.huston during the Spring '06 term at Pittsburgh.

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s11Q1W2 - CHEM 0120 Golde SPRING 2011 QUIZ 1 WEEK 2 Monday...

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