The solution may contain one or more of the following cations: Bit3 Mg+2 K+1 Ag+1 Pb+2 Nit2 Hg2+2 Reagen/t and Condition/s Observation/s A. To 20 drops of the unknown solution 3 drops 3M HCI was added; stirred and centrifuged. Added 1 more drop, stirred and centrifuged again white ppt colorless centifugate В white ppt. The precipitate was washed The centrifugate from A transferred into casserole, evaporated. The residue dissolved in 1 drop conc HCI, transferred to a test tube. Mixture in the test tube from C + 10 drops of 10% thioacetamide, 10 minutes in boiling water bath; centrifuged and decanted N/A no ppt very light tinge of yellow, clear liquid no ppt Precipitate from D + 5 drops 6M NaOH and 15 drops NazS, heated for 10 mins in water bath; centrifuged and decanted E colorless centifugate F Centrifugate from D + 4 drops NH4CI, alkalinized with 12M NH4OH no ppt 10% TA was added to the solution; heated for 10 mins in water bath; centrifuged and decanted no ppt ppt from E was dissolved in 5 drops conc HCl and made alkaline with 3M NaOH. Solid H2O2 no ppt was slowly added, with stirring; centrifuged and decanted G colorless liquid Centrifugate from F was evaporated until half volume, then + 3 drops 12M NH4OH and placed into a test tube. Mixture was heated in water bath for 3 minutes. About 15 drops of equal volumes of 3M (NH4)2CO3 and 95% ethanol solution were added to the heated mixture The final mixture in H was centrifuged and decanted N/A no ppt colorless centifugate purple color of flame no ppt formed in the hot mixture J The centrifugate from I was subjected to Flame Test K The washed ppt from B + 8 drops distilled water, then was heated for 3 minutes in a water bath with constant stirring, which was immediately centrifuged and decanted while hot, wherein 4 drops of K2Cr204 was added to the hot centrifugate The ppt from K + 10 drops NH4OH; stirred, centrifuged and decanted The centrifugate from L+ 3M HNO3 until acidic to blue litmus residue appears to be darkening colorless solution L

The solution may contain one or more of the following cations: Bit3 Mg+2 K+1 Ag+1 Pb+2 Nit2 Hg2+2 Reagen/t and Condition/s Observation/s A. To 20 drops of the unknown solution 3 drops 3M HCI was added; stirred and centrifuged. Added 1 more drop, stirred and centrifuged again white ppt colorless centifugate В white ppt. The precipitate was washed The centrifugate from A transferred into casserole, evaporated. The residue dissolved in 1 drop conc HCI, transferred to a test tube. Mixture in the test tube from C + 10 drops of 10% thioacetamide, 10 minutes in boiling water bath; centrifuged and decanted N/A no ppt very light tinge of yellow, clear liquid no ppt Precipitate from D + 5 drops 6M NaOH and 15 drops NazS, heated for 10 mins in water bath; centrifuged and decanted E colorless centifugate F Centrifugate from D + 4 drops NH4CI, alkalinized with 12M NH4OH no ppt 10% TA was added to the solution; heated for 10 mins in water bath; centrifuged and decanted no ppt ppt from E was dissolved in 5 drops conc HCl and made alkaline with 3M NaOH. Solid H2O2 no ppt was slowly added, with stirring; centrifuged and decanted G colorless liquid Centrifugate from F was evaporated until half volume, then + 3 drops 12M NH4OH and placed into a test tube. Mixture was heated in water bath for 3 minutes. About 15 drops of equal volumes of 3M (NH4)2CO3 and 95% ethanol solution were added to the heated mixture The final mixture in H was centrifuged and decanted N/A no ppt colorless centifugate purple color of flame no ppt formed in the hot mixture J The centrifugate from I was subjected to Flame Test K The washed ppt from B + 8 drops distilled water, then was heated for 3 minutes in a water bath with constant stirring, which was immediately centrifuged and decanted while hot, wherein 4 drops of K2Cr204 was added to the hot centrifugate The ppt from K + 10 drops NH4OH; stirred, centrifuged and decanted The centrifugate from L+ 3M HNO3 until acidic to blue litmus residue appears to be darkening colorless solution L

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.19QAP

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