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If Magnesium hydroxide is a white gelatinous precipitate, why is the confirmatory result indicated a blue precipitate?
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- 1. How is complete precipitation assured in the Group III Cations? 2. In the confirmatory test of Magnesium ion, why is it necessary to heat the centrifugate in water bath for 5 minutes? 3. If Magnesium hydroxide is a white gelatinous precipitate, why is the confirmatory result indicated a blue precipitate?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…why does a white precipitate form when Na2SO4 reacts with BaCl2
- Explain the role of potassium hexacyanoferrate(II), K4[Fe(CN)6] as a component of the Benedict’s reagent for the Estimation of GlucoseWhat is the role of cobalt glass for the flame test of potassium? Explain. Why was the flame test used for the qualitative determination of K and Na? Why was the sample being made alkaline with 3M KOH and heated for the qualitative test for NH4+?To determine the percent purity of a sample containing iron(II) ammonium sulfate; Suggest , 2 different methods for iron(II) ion. Explain in detail what errors may occur in the methods. (volhard method, gravimetric analysis, kjeldahl, etc.) Percentage content: 1-100% ; the solution concentrations to be used are 0.01-0.1M; Take the volumes of solution to be used between 1-50 mL
- Why does the Ni(dmg)2 precipitate not form if too much ammonia solution is added?Why is Mg2+ Most likely to give a precipitate with PO43- explain the answerCan precipitation give a confirmatory result on Group V cations? Why is the flame test used for the qualitative determination of Potassium ion and Sodium ion? What is the role of cobalt glass for the flame test of potassium? Why was the sample being made alkaline with 3M KOH and heated for the qualitative test for NH4+?
- Give a description and some background information on nickel schiff base complexes.Upon the test of Cadmium ion, a black precipitate was obtained rather than a yellow precipitate. What may have caused the blackening of the precipitate?Which among the following situations favors crystalline precipitate formation? Explain. a. Stirring slowly using reagents at room temp. b. Stirring slowly using reagents at high temp. c. Stirring vigorously using dilute solutions. d. none of the above