html5-img
1 / 6

Isolation of Lead chromate: “Paint Lab” Pre-Lab due before class on lab day!

Isolation of Lead chromate: “Paint Lab” Pre-Lab due before class on lab day!. qualitative vs. quantitative ? “Analyze soln of silver nitrate and lead nitrate ” Silver nitrate : AgNO 3 (Is it soluble in water? Ch.5, solubility table ) Silver Nitrate dissolved in water:

jimbo
Télécharger la présentation

Isolation of Lead chromate: “Paint Lab” Pre-Lab due before class on lab day!

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Isolation of Lead chromate: “Paint Lab”Pre-Lab due before class on lab day! qualitative vs. quantitative? “Analyze solnof silver nitrate and lead nitrate” Silver nitrate: AgNO3 (Is it soluble in water? Ch.5, solubility table ) Silver Nitrate dissolved in water: AgNO3 (s) +H2O(l) Ag+(aq)+ NO3-(aq) + H2O(l) Lead nitrate : Pb(NO3)2(Is it soluble in water?) lead nitrate dissolved in water: Pb(NO3) 2 (s) + H2O(l) Pb+2 (aq)+ 2NO3-(aq)+ H2O (l)

  2. Ag+ Pb+2 NO3- NO3- NO3- Original solnof AgNO3(aq)& Pb(NO3)2(aq) (step 2) Add sodium chloride soln(step 4) (NaCl(s)+ H2O(l) Na+(aq)+ Cl-(aq) +H2O(l)) ** to form a solid (precipitate) silver chloride: AgCl (s) You will isolate AgCl (s) via “filtration” (step 6) Ag+ Pb+2 AgCl(s) Pb+2 NO3- NO3- NO3- NO3- NO3- NO3- Cl- Na+ Na+

  3. Na+ Pb+2 NO3- NO3- NO3- Now solution (filtrate) contains Pb(NO3)2(aq) You will add aqueous soln of Potassium chromate (step 11). K2 CrO 4 (aq)2K+ + CrO4-2 **to form a solid (precipitate) lead chromate PbCrO4 (s) Isolate PbCrO4(s) via “filtration”(step 12). This is the “Paint”! Na+ Na+ NO3- K+ K+ NO3- Pb+2 K+ K+ NO3- CrO4-2 NO3- NO3- PbCrO 4 (s) NO3-

  4. Lab Write Up Must include: • ** Precipitation Reaction Equations (refer to Ch. 5) • (steps 4 and 11) • Data Table (Observations) • Post-Lab Questions • Lead chromate painting • Lab Reports Due: • Period 3: Fri. April 11 • Period 4: Wed. April 9

  5. Solubility Rules (Ch. 5) • Soluble Compounds: • Nitrates, Acetates, Perchlorates • Group IA metal salts, Ammonium Salts • Mostly Soluble: • Chlorides, Bromides, and Iodides (except Pb, Ag, Hg) • Sulfates (except Sr, Ba, Pb, Hg; CaSO4 is slightly sol) • Mostly Insoluble: • Carbonates, hydroxides, phosphates, and sulfides except for ammonium and Group IA metals • Hydroxides and Sulfides of Ca, Sr, and Ba are moderately soluble Silver nitrate AgNO3 lead nitrate Pb(NO3) 2

  6. Silver nitrate AgNO3 lead nitrate Pb(NO3) 2

More Related