Lab #7 - 10-25

Lab #7 - 10-25 - 1. 2. 3. (1) PbSl 2 (s) + 4 OH-(aq) ↔...

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Elisa Giordano Due: 11/1/06 Lab # 7 Nonsulfide Qualitative Analysis of Cations: Separating and Identifying Representative Cations from Groups A-E INTRODUCTION The purpose of this lab is to separate ions in known and unknown mixtures. Once the ions are separated, the presence or absence of each cation in the unknown mixtures is identified. A centrifuge is the machine used to properly separate cations in the mixture EXPERIMENTAL PROCEDURES *See Lab Manual* DATA TABLE Unknown ID code: Sample 5 Cations detected yes no Comments Group A: Pb 2+ Supernatant = Light blue; Precipitate = White Group B1: Fe 3+ Supernatant = Very light blue; Precipitate = Blue Group B2: Al 3+ Supernatant = Dark blue, Very pretty lime green color, gas being formed Supernatant turned a medium color blue Supernatant turned to a slightly darker blue, a different shade
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Unformatted text preview: 1. 2. 3. (1) PbSl 2 (s) + 4 OH-(aq) ↔ [Pb(OH) 4 ] 2-(aq) + 2 Cl-(aq) (2) Al (OH) 3 (a) + OH-(aq) ↔ [Al(OH) 4 ]-(aq) (3) Fe(OH) 3 (s) + 3 H 3 O + (aq) + 4 Cl-(aq) ↔ [FeCl 4 ]-(aq) + 6 H 2 O(l) (4) Ca 2+ (aq) + C 2 O 4 2-(aq) ↔ CaC 2 O 4 (s) (5) NH 4 Cl(s) ↔ NH 3 (g) + HCl(g) 4. CONCLUSION This lab was supposed to help with the understanding of whether there was a presence or absence of a certain ion in a solution. This lab was difficult. The lab manual was not very clear with the directions of what to do. Personally, I was very lost. I think this lab would have gone a lot smoother if the lab manual was clearer or if things were done a lot slower. I can safely say that I did not gain anything out of this lab. I am still confused (as if this lab report isn’t an obvious clue)....
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This note was uploaded on 05/04/2008 for the course CHM 114 taught by Professor Geldhart during the Fall '08 term at Rhode Island.

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Lab #7 - 10-25 - 1. 2. 3. (1) PbSl 2 (s) + 4 OH-(aq) ↔...

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