A solution of Na 2 CO 3 is added slowly to a solution initially containing

A solution of na 2 co 3 is added slowly to a solution

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63. A solution of Na2CO3is added slowly to a solution initially containing equal concentrations of Ba2+, Cd2+, Fe2+, and Zn2+ions. Which compound will precipitate first? Solubility Product Constant BaCO32.6 x 10¯9FeCO33 x 10¯11CdCO36 x 10¯12ZnCO31 x 10¯1064. According to the equations; H2CO3+ H2O <===> H3O++ HCO3¯ HCO3¯ + H2O <===> H3O++ CO32¯ what is the conjugate base of HCO3-? 65. What is the [OH¯] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M of Ba(OH)2? 66. What voltage will be produced by the electrochemical cell? Reduction Potentials Pb2++ 2 e¯ ---> Pb -0.13 V
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Al3++ 3 e¯ ---> Al -1.68 V (A) 2.97V (B) 1.55V (C) -1.81V (D) -2.97V 67. How many grams of cobalt metal will be deposited when a solution of cobalt(II) chloride is electrolyzed with a current of 10. amperes for 109 minutes? 68. Which element will have the greatest number of unpaired electrons? 69. What is the hybridization of the carbon that is bonded to the nitrogen? 70. Which molecule is polar? (A) CO2(B) NH3(C) SiCl4(D) PF5U.S. National Chemistry Olympiad: 1993 Local Section Test Answers
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Return to 1993 Local Section Test # Ans. # Ans. # Ans. 1. A 25. C 49. A 2. B 26. B 50. C 3. D 27. A 51. C 4. C 28. D 52. A 5. B 29. C 53. A 6. B 30. A 54. C 7. D 31. C 55. D 8. D 32. A 56. B 9. C 33. D 57. D 10. A 34. D 58. C 11. A 35. C 59. A 12. D 36. D 60. D 13. C 37. A 61. B 14. D 38. C 62. C 15. C 39. A 63. C 16. A 40. A 64. B 17. C 41. B 65. B 18. B 42. D 66. B 19. D 43. A 67. C 20. C 44. C 68. A 21. D 45. D 69. A 22. D 46. C 70. B 23. D 47. B 24. B 48. B
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