1. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __

2. V __ O 2 bubbled in O 2 ½ cell

3. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Na +,Cl -

4. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s)

5. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr ½ cell

6. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr ½ cell Cr (s)

7. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 -

8. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3

9. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+

10. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ OA OA RA --- OA ----- RA OA

11. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA

12. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode

13. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode

14. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e-

15. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+

16. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e -

17. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + -

18. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OE o red =+0.82V Cr (s)  Cr 3+ + 3e - E o ox =+0.74V

19. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - (1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 O)x3E o red =+0.82V (Cr (s)  Cr 3+ + 3e - )x2 E o ox =+0.74V

20. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - 3/2O 2(g) +6H + (10 -7 M) +6e -  3H 2 OE o red =+0.82V 2Cr (s)  2Cr 3+ + 6e - E o ox =+0.74V

21. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - 3/2O 2(g) +6H + (10 -7 M) +6e -  3H 2 OE o red =+0.82V 2Cr (s)  2Cr 3+ + 6e - E o ox =+0.74V + 3/2O 2(g) +6H + (10 -7 M) +2Cr (s)  3H 2 O+2Cr 3+ E o =+1.56V

22. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - 3/2O 2(g) +6H + (10 -7 M) +6e -  3H 2 OE o red =+0.82V 2Cr (s)  2Cr 3+ + 6e - E o ox =+0.74V + (3/2O 2(g) +6H + (10 -7 M) +2Cr (s)  3H 2 O+2Cr 3+ )x2 E o =+1.56V 3O 2(g) +12H + (10 -7 M) +4Cr (s)  6H 2 O+4Cr 3+

23. You try this! Create and label: O 2 ½ cell and Cr (s) ½ cell (neutral conditions) V __ O 2 bubbled in O 2 ½ cell NaCl Pt (s) Cr (s) Cr ½ cell Cr(NO 3 ) 3 Cr 3+, NO 3 - KNO 3 O 2, Na +, Cl -, Pt, K +, NO 3 -, Cr (s), Cr 3+ SOA OA RA --- OA ----- SRA OA Anode Cathode e-e- NO 3 - K+K+ 1/2O 2(g) +2H + (10 -7 M) + 2e -  H 2 OCr (s)  Cr 3+ + 3e - + - 3/2O 2(g) +6H + (10 -7 M) +6e -  3H 2 OE o red =+0.82V 2Cr (s)  2Cr 3+ + 6e - E o ox =+0.74V + 3/2O 2(g) +6H + (10 -7 M) +2Cr (s)  3H 2 O+2Cr 3+ E o =+1.56V pH increases Mass decreases corrosion 3O 2(g) +12H + (10 -7 M) +4Cr (s)  6H 2 O+4Cr 3+

24. And Now, your homework!!!!!