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What is the reagent in the solubilities of the sulfate and chromate of Barium that is used to distinguish the 2 compounds?
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- Which compound of Grp 3 cations is a white, gelatinous precipitate that produces a colored precipitate when in contact with its confirmatory reagent?6. The solubilities of the sulfate and chromate of Barium in this reagent is used to distinguish the 2 compounds. (Provide only the chemical formula) 7. How should you write the chemical formula of zinc ammonia complex ion? 8. Identify the chemical formula of Grp 3 cation/s that form a pink precipitate when treated with thioacetamide. 9. What reagent acts as buffer to prevent precipitation of Magnesium Hydroxide during the analysis of Grp 3 cations? (chemical formula) 10. What ion is reduced when a precipitate which may contain Barium Chromate is added with HCl and concentrated? (chemical formula of the resulting reduced ion)1.) What is the effect of adding 6M HNO3 to solid silver acetate? 2.) What is the purpose of adding 6M HNO3 to solid silver acetate? 3.)Explain how the dichromate-chromate equilibrium shifts in response to an increase or decrease in H+ ions. Express this in words and as an equation. 4.) (b) Explain how the dichromate-chromate equilibrium shifts in response to an increase or decrease in OH- ions. Express this in words and as an equation.
- A sample of alfalfa meal weighing 2.0 g is analyzed by Kjeldahl method for the percentage of nitrogen. The liberated NH3 is caught in a solution of H3BO3, and 8.23 ml of HCl are required in the subsequent titration. A sample of pure (NH4)2SO4 (132.12) weighing 0.61 g is treated with excess NaOH and the liberated NH3 (17.04) is also caught in H3BO3. The resulting solution requires 20 ml of the acid for titration. Calculate the percentage of protein in the sample using 6.25 as the factor.B: Similar to Part A, using 97 mL of an aqueous solution containing 7.22 g of the compound with a Kp value of 5, how much of the compound would be extracted in total using two 41 portions of diethyl ether? Report the total mass in grams to two decimal places.Draw a schematic diagram using this information. Preparation of the solution Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves. Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly. Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate. Filtration of the solution Take a funnel and fix a filter paper in it and clamp it to a stand. Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out. Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue. Concentration of the filtrate to crystallisation point Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. To…
- In the Standardization of Sodium Thiosulfate (Redox Titration), why is it necessary to remove the brown color of the solution?An impure sample containing 2.00 g of sodium carbonate and bicarbonate was taken. It was dissolved in water and then crushed with hydrochloric acid (0.1 N). If the burette reading was at the end point of the phenolphthalein 7.5 ml and at the end of the orange methyl point was 20.0 ml. Calculate the ratio The percentage of sodium bicarbonate in the sample. Note that the molecular weight of sodium bicarbonate is 84 *(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In the Winkler Titration Method, the starch solution turns colorless in the presence of free iodine in the solution to be titrated. In the Winkler Titration Method, the endpoint is determined by the visual indicator, methyl violet. 2. Radioactive elements gain stability by single emission, and a successive emission creates a series. Half-life is the half of the amount of life that a radioactive material will continue to exist before it decays completely. 3. In collecting the tap water sample used in the experiment on dissolved oxygen determination, the container was allowed to overflow so that no bubbles will be formed inside the container that may affect the amount of DO in the water sample. In the experiment on dissolved oxygen determination, the tips of the pipettes should be well above the surface…