Creating a Positive Learning Environment for Everyone Be respectful of your classmates Save conversation for clicker portions of lecture Put cell phones in “airplane” mode Turn off tablets Close laptops

Announcements Precipitation lab write-up due tomorrow at the start of discussion Text HW due tomorrow in discussion Lon-capa HW #4 Type 1 due Monday, Oct 16th at 7:00pm Lon-capa HW #4 Type 2 due Wednesday, Oct 18th at 7:00pm

Solubility Rules (Page 127) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride 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.

Clicker #1 When aqueous silver nitrate and aqueous sodium chromate are mixed, what are the formulas of the products? A) Na2NO3 and AgCrO4 B) NaNO3 and Ag2CrO4 C) NaNO3 and AgCrO4 D) Na2NO3 and AgCr2O7 E) NaNO3 and Ag2Cr2O7

Talk About It: What is incorrect about each of the net ionic equations shown below? 1) Ag2+(aq) + CrO4-2(aq)  Ag2CrO4(s) 2) Ag2+(aq) + CrO4-2(aq)  Ag2CrO4(s) 3) Ag+(aq) + CrO4-2(aq)  AgCrO4(s)

Solubility Rules (Page 127) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride 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.

Clicker #2 When potassium chloride and sodium nitrate are mixed, what precipitate will form? KCl(aq) + NaNO3(aq) → A) KNO3 B) NaCl C) KCl D) NaNO3 E) No precipitate will form. Solubility Rules Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride 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.

Clicker #3 Will the resulting solution conduct electricity? A) No. There is no precipitate formed and a solid is required to conduct electricity. B) No. The resulting solution is pure water which does not conduct electricity. C) Yes. The resulting solution is pure water which conducts electricity. D) Yes. The resulting solution contains ions which conduct electricity.

Solubility Rules (Page 127) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride 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.

Clicker #4 Is the resulting net ionic equation a chemical reaction? H+(aq) + OH–(aq) → H2O(l) A) Yes. There is a new compound formed from H+ and OH–. B) Yes. Whenever two compounds are mixed, a chemical reaction always occurs. C) No. A precipitate (solid) must be formed to be considered a chemical reaction. D) No. There was no color change so a chemical reaction did not occur.

Solubility Rules (Page 127) Most nitrate salts are soluble. Most salts of sodium, potassium, and ammonium cations are soluble. Most chloride 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.

Clicker #5 What are the spectator ions in this reaction? A) H+, OH- B) Ba+2, SO4-2 C) H+ only D) Ba+2, SO4-2, H+, OH- E) There are no spectator ions.