Chem 161-2010 Lecture 6

Chem 161-2010 Lecture 6 - CHEMISTRY 161-2010 Lecture 6...

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Unformatted text preview: CHEMISTRY 161-2010 Lecture 6 ANNOUNCEMENTS E-MAIL EXAMS/QUIZZES Review 4 difficult hourly 1 problems Chem 161-2010 Lecture 6 1 PLAN FOR TODAY CHAPTER 4 STRONG AND WEAK ELECTROLYTES ACID-BASE REACTIONS PRECIPITATION REACTIONS Chem 161-2010 Lecture 6 2 ROLE OF A N ELECTROLYTE IN AN ELECTROLYSIS CELL Will the light bulb go on? Chem 161-2010 Lecture 6 3 +-- + LIGHT BULB ANODE CATHODE H 2 O An electric current is a flow of charged particles. In the electrodes and electrical wire these charged particles are the electrons. In the solution these charged particles are the ions, called electrolytes. This cell must have an electrolyte to work. To complete the circuit, the anions flow to the positively charged electrode, and the cations flow to the negatively charged electrode. STRONG AND WEAK ELECTROLYTES ET: Discuss with a battery and light bulb, with battery terminals in water. Strong electrolytes: Good conductors of electricity; 100% ionization o All soluble salts NaCl Na + + Cl- o All 6 strong acids HCl, HBr, HI, H 2 SO 4 , HNO 3 , HClO 4 HCl H + + Cl- or preferably: HCl + H 2 O H 3 O + + Cl- o All strong bases (all hydroxides from groups I & II) Metal hydroxides, e.g., NaOH NaOH Na + + OH- Weak electrolytes Weak conductors of electricity; weak ionization o All weak acids, e.g., HC 2 H 3 O 2 (acetic acid) HC 2 H 3 O 2 + H 2 O H 3 O + + C 2 H 3 O 2- o All weak bases, e.g., NH 3 and amines NH 3 + H 2 O NH 4 + + OH- Non-electrolytes Non-conductors of electricity; zero ionization o Virtually all organic chemicals, except organic acids and organic bases; e.g., CH 3 CH 2 OH (ethanol), C 6 H 12 O 6 (glucose) CH 3 CH 2 OH CH 3 CH 2 O- + H + Chem 161-2010 Lecture 6 4 100% 100% 100% HILL AND PETRUCCI 4 TH EDITION CHEM 161-2009 RECITATION 4 TH WEEK CHAPTER 4 STRONG AND WEAK ELECTROLYTES 1. The best electrical conductor of the following aqueous solutions is (a) 0.10 M NaCl; (b) 0.10 M CH 3 CH 2 OH; (c) 0.15 M CH 3 COOH; (d) 0.10 M CH 2 OHCHOHCH 2 OH (a) NaCl Na + + Cl- Yes. NaCl ionizes completely, so it is a strong electrolyte....
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This document was uploaded on 11/02/2011 for the course GEN CHEM 162 at Rutgers.

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Chem 161-2010 Lecture 6 - CHEMISTRY 161-2010 Lecture 6...

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