Unformatted text preview: EXPERIMENT 29: SPOT TESTS ADVANCE STUDY ASSIGNMENT Refer to the directions for Experiment 29 when answering the following questions: / f i 1. Each of the following tests was run on a different unknown solution. State which ior is indicated by the observation. Assume no interfering ions are present to complicate the test for each ion. a) Addition of 6M NaOH and Al to the solution produces a vapor which turns red litmus paper blue. T.v 71 "fa" < NOa 00 J- NWt - . , CV--.-V b) Addition of 6M nitric acid makes a yellow solution turn orange. c) Addition ot any strong acid produces an effervescence. ~T^\ CO $ kr^.-A. ' - - A d) Addition of silver nitrate produces a white precipitate. C\~ To^l 3. 3O3" CU..U ,.,, 5.1^Q - e) Addition of barium chloride produces a white precipitate. f) Addition of 6M nitric acid plus 0.5M ammonium molybdate produces a yellow precipitate. ^3- p^^ , i (j 2. You are given an unknown which contains one or more of the 7 ions listed in this Experiment. You conduct the following tests, each on separate portions of the unknown. After each test, list the conclusions) drawn from that test. After the tests, tabulate the 7 possible ions as present, absent, or in doubt. a) Addition of 6M nitric acid causes no effect. . b}. Adding nitric acid and silver nitrate causes no effect. \\t , tU%3 V' Ions present ^ C\- o4 ' t - -c ,U U^c. . U c) Adding nitric acid and 1M barium chloride produces a white precipitate. d) Nitric acid plus ammonium molybdate produces a yellow precipitate. VU K^v VW\ "S'A . : - Pb^' ^^vVu^vt A ^ a ^ Ions absent' Tons in doubt <>S 00 f .fo- (Continued) S6N" ...
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Emil Slowinski, Macalester College
Emil J. Slowinski is an Emeritus DeWitt Wallace Professor of Chemistry at Macalester College. He earned a B.S. degree from Massachusetts State College in 1946 and a Ph.D. in physical chemistry from the Massachusetts Institute of Technology in 1949. He taught at Swarthmore College, 1949-1952; the University of Connecticut, 1952-1964; and Macalester College, 1964-1988. His sabbatical leaves were at Oxford University in 1960 and the University of Warsaw in 1968. He is a co-author, with Bill Masterton and/or Wayne Wolsey, of more than 25 books on various areas of general chemistry. He was actively involved in all editions of CHEMICAL PRINCIPLES IN THE LABORATORY up through the 9th edition, and though now retired from active writing still offers insights, advice, and support to his coauthors.
Wayne C. Wolsey, Macalester College
Wayne C. Wolsey, an inorganic chemist, received his B.S. from Michigan State University in 1958 and his Ph.D. from the University of Kansas in 1962. He joined the Macalester College faculty in 1965 and is now in "semi-retirement." His last three sabbaticals were spent at the Oak Ridge National Laboratory. In 2001-2002, he investigated various complexing agents for their effectiveness in dissolving calcium oxalate kidney stones, in collaboration with a former student, now a urologist. He has received various awards, including the Minnesota College Science Teacher of the Year in 1989; Macalester's Thomas Jefferson Award in 1993; designation as a MegaMole contributor to Minnesota Chemical Education in 1997; and an award from the Minnesota State AAUP Conference in 2001 for his support of academic freedom and shared governance. He remains professionally active in a number of scientific organizations.
Robert Rossi, Macalester College
Robert C. Rossi is the Laboratory Supervisor in the Chemistry Department at Macalester College. He obtained a B.S. degree in chemical engineering from the University of Wisconsin - Madison in 1993 and upon graduation joined the Peace Corps, serving in the Fiji Islands. He then taught and carried out applied photoelectrochemistry and semiconductor physics research at the California Institute of Technology, earning a Ph.D. in 2001. After several years teaching as a visiting professor at Carleton College, he moved to Macalester College, where he has been since 2003. In 2011 he became a co-author of Chemical Principles in the Laboratory, first writing for the 10th Edition.