1. A “barium/calcium/magnesium" unknown solution and aqueous (NH4)2SO4 produced a white precipitate that gave a green flame test. After centrifuging and decanting, the addition of aqueous (NH4)2C204 produced a white precipitate that gave a brick-red flame test. After centrifuging and decanting, the addition of aqueous NazHPO4 and NaOH gave no reaction. State the cation(s) confirmed present and absent in the unknown solution. Cation(s) present Cation(s) absent

1. A “barium/calcium/magnesium" unknown solution and aqueous (NH4)2SO4 produced a white precipitate that gave a green flame test. After centrifuging and decanting, the addition of aqueous (NH4)2C204 produced a white precipitate that gave a brick-red flame test. After centrifuging and decanting, the addition of aqueous NazHPO4 and NaOH gave no reaction. State the cation(s) confirmed present and absent in the unknown solution. Cation(s) present Cation(s) absent

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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In following these steps . Complete the table and provide th given chemical reactions in the qualitative analaysis of Group 3 Cations. Procedure 1. Place 20 drops of each of the following aqueous solutions to separate centrifuge tubes: 0.1M Cr (NO3)3, 0.1M Al (NO3)3, 0.1M Co (NO3)2, 0.1M Zn (NO3)2, 0.1M Mn (OH)2, 0.1M Ni (NO3)2, 0.1 M Fe (NO3)3. Make each solution basic by adding few drops of 6M NH4OH. Confirm using a litmus paper. 2. Add 5 drops of freshly prepared 6M (NH4)2S to each centrifuge tube. Place the samples in thecentrifuge machine for 3 mins. After centrifuge record results. Decant the supernatant liquid of all the samples. 3. Add one drop of NH4OH in each centrifuge tubes. Add 20 drops of distilled water in eachcentrifuge tubes. Then add a few drops of 6M HCl in each solution. Place the samples in the water bath for 10 mins. After water bath, centrifuge the samples for 3 mins. 4. After centrifuge, add a few drops of 6M NH4Cl in each sample. Decant the supernatant liquid…
Prepare a written copy of the complete separation scheme for a solution that contains Ag+, Fe3+, Cr3+, Ni2+, Zn2+, and Ba2+ Make sure that your separation scheme includes: separation of each ion into its own individual sample AND precipitation BEFORE a confirmation test is done all phases and visible colors, if applicable reagents and conditions necessary to carry out each step balanced equations, including phases, for each step
You are assigned an unknown solution that contains Group III cations. To -1 mL of this solution was added 6 M NH3 the solution was agitated to mix well, and a reddish-brown precipitate with a gelatinous solid clinging to the inner walls of the test tube was observed. The solution was centrifuged and the supernatant was tested for completeness of precipitation by adding an additional drop of 6 M NH3. No cloudiness was observed as the drop of reagent diffused through the solution. The supernatant was then carefully decanted into a clean test tube, labeled (1st solution), and saved for further testing later. The precipitate remaining in the test tube was washed with a small amount of water, centrifuged, and the wash decanted and discarded. To the precipitate was added about 10 drops of 6 M NAOH plus ~1 mL H20 and the test tube was vigorously agitated. The resulting suspension was centrifuged and the supernatant liquid was transferred to another clean test tube and clearly labeled (2nd…