Experiment 8 Lab Report - Determining and Separating...

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Determining and Separating Selected Metal Ions LABORATORY WRITTEN REPORT OBJECTIVE The purpose of this experiment is to determine if the precipitation reactions serve as a qualitative or a quantitative measure of a reaction, to use differing chemical properties of metal ions to separate and identify the ions, to write chemical reactions as molecular and net ionic equations, to identify spectator ions in a chemical reaction, and to separate a precipitate using a common laboratory technique. EXPERIMENTAL METHOD Materials: All materials necessary were provided by the Virginia Tech Department of Chemistry. Synthesis: Part 1: Analysis Using Precipitation Reactions 5 drops of Ba(NO 3 ) 2 , Pb(NO 3 ) 2 , Co(NO 3 ) 2 , Ni(NO 3 ) 2 , NH 4 NO 3 , and AgNO 3 were each added to two well plates. To every well in the first row of the first well plate, 10 drops of 0.1 M NaCl solution was added. To every well in the second row well plate #1, 10 drops of 0.1 M Na 2 SO 4 was added. In the third row of wells in well plate #1, 10 drops of Na 3 PO 4 was added. In the fourth row of wells in well plate #1, 15 drops of 0.1 M NaOH was added. To every well in the first row of well plate #2, 10 drops of 0.1 M KI was added. To every well in the second row of well plate #2, 10 drops of 0.1 M Na 2 CO 3 was added. For every mixture of chemicals, the absence or presence of a precipitate was recorded. Part 2: Separation of the Precipitate in Precipitation Reactions Heat 100 mL of deionized water in a 150 mL beaker, the water was hot, not boiled, it was needed for later in the experiment. 20 drops of the Ag + (aq) and Pb 2+ (aq) metal ion mixture and 10 drops of 3 M NaCl was added to a centrifuge tube. It was centrifuged for one minute. Drops of 3 M NaCl were added afterward to assure that no more precipitation was observed. It was then centrifuged for another minute, and the centrifugate was removed. 20 drops of ice-cold deionized water was added to the precipitate AgCl and PbCl 2 , and 4 drops of 3 M NaCl was added to ensure that all of the Ag + and Pb 2+ have been precipitated. This tube was then centrifuged for one minute, and the centrifugate was discarded. Then 40 drops of deionized water was added to the precipitate, stirred and lowered into the beaker of hot water. After being in the hot water for 5 minutes, the tube was centrifuged for another minute and the centrifugate was removed.
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