CHEM 127 LAB REPORT 5.docx - COLANDREO 1 LAB REPORT 5 SEPARATION OF GROUP 1 CATIONS MICAELA COLANDREO PARTNER QIAN LUI CHEM 127 SEC 12178 COLANDREO 2

CHEM 127 LAB REPORT 5.docx - COLANDREO 1 LAB REPORT 5...

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COLANDREO LAB REPORT 5 SEPARATION OF GROUP 1 CATIONS MICAELA COLANDREO PARTNER : QIAN LUI CHEM 127 SEC 12178 3/15/17 1
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COLANDREO PURPOSE: To qualitatively identify the presence of Ag + , Hg 2 + , and Pb 2+ ions in a known and unknown solution. FUNDAMENTAL PRINCIPLE OF EXPERIMENT: A cation is a positively charged ion, meaning it has more protons than electrons. This experiment will focus on the separating of group 1 cations using the method of selective precipitation. Selective precipitation is one of the simplest yet most successful ways to separate one metal cation from another, meaning that one or more cations can be precipitated from other cations that are in the same solution. When using this approach one must first consider what reagent is best suited for precipitating the cation in focus and the amount of reagent to be used. The reagents used in our experiment today include HCl, NH 3 , HNO 3 and K 2 CrO 4. Our experiment will be dealing with qualitative analysis meaning we will be looking for observed changes instead of calculated data. PROCEDURE: Two experiments were conducted, one with a known substance and another with an unknown substance. Both were conducted in a similar manner with only two steps or so differentiating. We began with 15 drops of our known substance, which contained all
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