Chemical Crossword Puzzle J. J. CARNEY COLLEGE OF ST. THOMAS ST PAUL.MINNESOTA
Across
1. Isotom
7. energy, heat 14 Enzyme producing NHa and COa , a soap 16. Sodium 17. Slow (music) 18. Colloidal suspension 20. Bundle of sticks 21. Tardy 22. Concentration term 24. Fade8 25. Species (ab.) 27. Behave theatrically 29. Nucleon 33. To repeat 37. All (combined form) 38. Most metallic Gr V-A 40. Tin 41. Bad (prefix) 42. Baseball term, alkali halide 43. Metal in alloy steels 45. First transition metal 47. Motor vehicle 48. Pressure is due to molecular (PI.) 51. Halogen, oxidation state +3 .53. Beginning 55. Commonest alkali 56. Extend fully 59. Research collaborators I . Woody plant 65. Type of wood 67. Diphosphopyridine nucleotide 68. Smallest units of an element 69. An aralkyl radical 71. Vinegar acid 7 2 . Pittsburgh pro 13. Determine volumetrirally
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Journal of Chemical Education
Â¥ Down 1. point instrument 2. Wohler's synthetic 3 Metric prefix 4 Keep up with dev 5 Common organic prefix 6 From, of (Fr ) 8. Element 67 9. Sprite 10. Apprehender of written material 11. Wise Men 12. Minute particle 13. Permito 15. Chemical unit of reaction IS. Thus 19. Thin sheets (combined form) 23. Decomposes 26. Nuclenn 28. Sinew 29. Standard 30. Occlusion (combined form) 31. Quantity specified by definition 32. Element 41 34. Both (combined form)
35. Tight 36 Other than
39. Existo 44. of Tech (ab 1 46 Old symbol, element 41 49 Electrolvtes in solution 50. Add a crystal 52. Subject of a chemical study 54. Narrow strip 56. Unilateral descent groups 57. Creator of artistic expression 58. Queen 60. Common metal with oxidation state +7 62. meter, measures fluid flow 63. Give off 64. Verb suffix become 66. Solid geometric form (ah.) 68, Exert energy 70. Football position (ab.) 71. Three-toed sloth (See next issue for solutwn)
dilution; 'i = 1 applies to a titration in which the concentration of the titrant is equal to the original concentration of the species being titrated. It is evident that for ?' 1,theapproximate equation can be used, with an error not exceeding 00100 in pM, even at 0.1% titrated prior or subsequent t o equivalence, as long as Co/K'12 exceeds lo4. For acid-base neutralizations, this corresponds to a pH difference of 4.00 units between the initial pH and that at equivalence; thus COmustequal or exceed 1.00 x l o 3
Table 3.
Minimum Values for F for Selected Values of
En
F
> Fur values of
-EV
j > 1. Z'i. = -uhcrc E ' M 1 Ev
+
defined by equation (221, but now only applies subsequent to equivalence, and E Mis obtained from Table 3 s
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(1) KOLTHOFF, I. M., A N D STESGER,V. A,, "Volumetric Anal. ysis," 2nd rev. cd., Interscience Publishers, Inc., New York. 1942. Chau. 2 mil Cham 3. (2) Rmr, JOHN k., "Hydrogen Ion Concentration," Princeton University Press, Princeton, 1952, Chap. 9. B., J . Chem. Sue., K28, 857. (3) CAVAXAOH, (4) FORTUIN, J. ]\I H., . Anal. Chim. A d a , 24, 175-91 (1961). E., Anal. Chin. Ada, 22, 101-5 (1960). (5) BISHOP, (6) ROLLER, P. S., J . Am. Chem. Soc., 54, 3498 (1932). (7) WAR MI.:^, M., "Tables of Elementary Functions," Pergamoa Press, New Y m k 1960; CC~MRIE, I,, J., "Chamber's Six &"re .~athcr~mticul Tables," 1). Van Nostnmcj New York, 1949, V d 2.
Journal o f Chemical Education
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Solution to the Puzzle on p. 496 of the September Issue.
