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Quantitative Analysis

Quantitative Analysis - Emily Bissel April 8 2008 MS 1116...

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Emily Bissel April 8, 2008 MS # 1116 Lab Partners: Becca Angell & Meg Anders Tuesday PM Lab 10: Qualitative Analysis of Inorganic Compounds Introduction: In qualitative analysis, substances are tested for the presence of a specific ion. These ions can be recognized through a variety of different procedures by the presence of specific characteristics demonstrated only by them. For example, by placing certain ions in a flame, the color of the flame will change to display the ions contained. Potassium (K+) yields a purple flame. In addition to the flame color, solubility can be a strong contributor to determining the contents of a substance. In this lab, 14 unknowns are given which need to be identified. Through writing the balanced equations the reactions which are occurring can be seen on paper, and explained more easily. Using solubility charts, pH tests and flame color recognition the 14 unknowns were identified. Results: Identity of Solution A-23, MgSO 4 a. Physical characteristics: Solution was colorless and weakly acidic (pH ~ 6) according to the pH paper b. Chemical Reactions: - When combined with M-23 the solution did not yield a precipitate. MgSO 4 (aq) + CuSO 4 (aq) MgSO 4 (aq) + CuSO 4 (aq) - When combined with F-23 (known Na 2 CO 3 ) the solution yielded a white precipitate MgSO 4 (aq) + Na 2 CO 3 MgCO 3 (s) + Na 2 SO 4 (aq)
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Identity of Solution B-23, Sr(NO 3 ) 2 a. Physical characteristics: Solution was colorless and weakly acidic (pH ~ 6) according to the pH paper. b. Chemical Reactions: - When placed into a flame the B-23 solution yielded a red flame; identifying a Sr 2+ ion in the solution - When combined with F-23 the solution yielded a white precipitate Sr(NO 3 ) 2 (aq) + Na 2 CO 3 (aq) SrCO 3 (S) + 2NaNO 3 (aq) - When combined with H-23 the solution yielded a White precipítate: - Sr(NO 3 ) 2 (aq) + 2LiOH (aq) SrOH 2 (S) + 2LiNO 3 (aq) Identity of Solution C-23, KI a. Physical Characteristics: Solution was colorless and weakly acidic (pH ~6) according to the pH paper. b. Chemical Reactions: - When combined with I-23 the solution yielded a yellow precipitate KI (aq) + AgNO 3 (aq) KNO 3 (aq) + AgI (s) - When combined with H-23 the solution did not yield a precipitate because I - only forms a precipitate with Ag 2+ , Hg 2+ , and Pb 2+ , and K + will never form a precipitate KI (aq) + LiOH (aq) KOH (aq) + LiI (aq) - When placed into a flame the C-23 yielded a purple flame; confirming a K +
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