Group 2, separated first by precipitation as an acid-insoluble chloride. Includes the ions: Hg2, pb2, bi3, cu2, and database Cd2 Sulfide source is Thioacetamide. Group 3 Separated first by precipitation as an alkaline-insoluble sulfide. Includes the ions: Ni2, co2, mn2, zn2, al3, cr3, and Fe3. Also uses Thioacetamide, but under basic (alkaline) conditions. Group 3 also has individual confirmatory tests for each ion. Group 4 Separated by precipitation as an insoluble carbonate. Includes the ions Ba2, ca2, and Sr2. Identification includes flame tests for each metal ion.
Group 1, once again, centrifuge and separate the essay liquid from the solid using the micropipette. The liquid will be tested for the lead ion by adding K2CrO4. Group 1, the solid precipitate that remains will be treated with 6m nh3 with formation of a black solid confirming mercury(I) is present. Group 1, the liquid solution from the previous step is tested for silver ion by acidifying with hno3. The formation of a white precipitate confirms this ion. Litmus Tests, throughout the schemes, you may be required to add acid until the solution becomes acidic or base until it becomes alkaline. Blue litmus pink acidic. Red litmus blue basic (alkaline correct method use stirring rod dunk in solution, then touch to paper.
Classic scheme has five groups, group 1, includes Ag, Pb2, and Hg22 ions. Separated out as insoluble chlorides by adding 6m hcl. Group 1, the precipitate is then separated from the remaining liquid by first using a centrifuge. Group 1, then, the liquid is extracted using a micropipette. Group 1, the Ksps for each chloride are: PbCl2.7 x 10-5, agCl.8 x 10-10. Hg2Cl2.2 x 10-18, being the most soluble, the lead(II) chloride will dissolve fairly readily in hot water. Thus, we will add di water and heat in a hot water bath to dissolve this compound.
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Download, skip this Video, loading SlideShow in 5 Seconds. Qualitative analysis PowerPoint Presentation, download Presentation. Qualitative analysis 1 / 15, qualitative analysis. Determines only the presence (or absence) of a substance sometimes referred to as Wet Chemistry Involves the identification of ions present in solution. Copyright Complaint Adult Content Flag as Inappropriate. I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
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Blue to red litmus paper. Silver nitrate added makes white cloudy ppt. Ammonia added and @ 5 min. Ammonia added no rxn. White cloudy ppt formed when barium chlorine and calcium chlorine added. Potassium makes clear bright clear color and makes acidic.
CO32-, bubbling gas immediately and gas formed turns blue litmus red. Red to Blue litmus. Bubbles formed but @ 2 min. Silver nitrate added white cloudy ppt. Appeared on top and yellow mucus color. . Ammonia added ppt disappears. Ammonia added is clear. Barium added creates jellylike ppt, light white ppt and calcium added white jelly form and translucent. 3M sulfuric acid makes bubbling and fizzing immediate but stops @ 3mins.
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Silver nitrate essay added and soln turns light clear blue mist ppt. . Ammonia added makes blue ppt on bottom and @ 5 mins. Ammonia added has no real rxn and soln is clear. Intense white cloudy(milky) ppt formed instantly that settled on bottom. 3M sulfuric acid has no rxn and is acidic. Adding potassium makes clear bright resume purple and acidic. C2O42-, no gas formation and no reaction occurred.
Blue litmus stayed blue. . Dark purple ppt form on top. . Yellow soln under. @ 5 min, soln turned brown on top and clear yellow in color. Stirring creates light brown orange color. SO42-, no phd gas and no reaction occurred. Blue litmus turns red. .
watch glass. @ 10 min orange-yellow and gray left over. Blue litmus paper turned red. Cloudy intense green like mucus ppt.
White fogging on watch glass. A little yellow powder left. Blue litmus turned red. Blue litmus stayed blue. Transparent shredder pink soln.; after three mins and stirring soln turned bright clear pink. Br, blue litmus turned red immediately from gas that formed. Bubbling white and @ 10 min. Dark orange left over. Cloudy light green-yellow ppt formed immediately.
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Written by denise Tram, in this lab, we are to analyze the different processes that will be used in laboratory to help us gain experience in identifying different anions and how we can become familiar with different anions by observations of the reactions and products. In this lab we separated precipitates and by doing this we were able to confirm the reactions that create a precipitate and we used this to identify which anions can be reacted in which a gas formation and a color change appears. By being able to correctly proceed in this lab, we will be able to use this information in future experiments in which the solutions would be unknown. 1) Begin this section by summarizing your results from the screening tests. Do his by creating table modeled after the one below. Anion, test ii prezi (18 m h2SO4 test iii (AgNO3). Test iv (BaCl2/CaCl2 test V (K2MO4. Blue litmus turned red immediately.