To Do… Electronic homework Exam 2: Thursday, March 15 OWL:

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To Do… Electronic homework Exam 2: Thursday, March 15 OWL:

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Clicker #1 When lead(II) nitrate and potassium iodide are mixed, what precipitate will form? Pb(NO3)2(aq) + KI(aq) → A) KNO3 B) KI C) Pb(NO3)2 D) PbI2.

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Clicker #1 When lead(II) nitrate and potassium iodide are mixed, what precipitate will form? Pb(NO3)2(aq) + KI(aq) → A) KNO3 B) KI C) Pb(NO3)2 D) PbI2.

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To Do… Electronic homework Exam 2: Thursday, March 15 OWL: Chapter 9 (Part 2): Wednesday, March 7 Chapter 13 (Gas Stoichiometry): Friday, March 9 Chapter 15 (Solution Stoichiometry): Tuesday, March 13 Lon-Capa: Exam 2 review: due Wednesday, March 14 by 10 pm Exam 2: Thursday, March 15

To Do… Lectures Lab tomorrow Discussion Section Chapter 9 and Sections 13.10 and 15.6 & 15.7. Lab tomorrow Pre-lab is due before lab. Discussion Section Turn in text homework. Turn in lab write-up.

Starting With Masses You react 84 g of N2(g) with 22 g H2(g) to produce ammonia [NH3(g)]. Determine the mass of ammonia produced. Determine the mass of left-over reactant.

Clicker Question When lead(II) nitrate and potassium iodide are mixed, what precipitate will form? A) KNO3 B) PbI C) K(NO3)2 D) PbI2 E) No precipitate will form. Solubility Rules Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride and iodide salts are soluble. Exceptions: Ag+ and Pb2+. Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+. Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+. Most sulfide, carbonate, and phosphate salts are only slightly soluble.

Stoichiometry Problem Suppose we mix 100.0 mL of 0.100M Pb(NO3)2 (aq) with 0.200M KI (aq). What volume of KI solution do you need to completely react with Pb(NO3)2? What is the mass of solid produced?

Stoichiometry Problem Consider 100.0 mL of 0.30M Pb(NO3)2 (aq) mixed with 100.0 mL of 0.40M KI (aq). What ions are left in solution after the reaction is complete? What is the mass of solid produced? What are the concentrations of the ions left in solution after the reaction is complete?

Stoichiometry Problem Consider 100.0 mL of 0.30M Pb(NO3)2 (aq) mixed with 100.0 mL of 0.40M KI (aq). Determine the number of moles of all ions in the solution initially. Determine which reactant is limiting.

Clicker Question What ions are left in solution after the reaction is complete? I. Pb2+ II. NO3– III. K+ IV. I– A) II and III B) I and IV C) I, II, and III D) I, II, III and IV E) No ions are left in solution after the reaction is complete.

Stoichiometry Problem Consider 100.0 mL of 0.30M Pb(NO3)2 (aq) mixed with 100.0 mL of 0.40M KI (aq). Determine the mass of solid formed from a complete reaction. Determine the concentrations of all ions after the reaction is complete.