Elemental gold is being recovered by electrodeposition from a solution with tiny amounts of Au(III). Holding other factors constant, what can be done to maximize the yield of recovered gold?
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Elemental gold is being recovered by electrodeposition from a solution with tiny amounts of Au(III). Holding other factors constant, what can be done to maximize the yield of recovered gold?
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- A chemist is performing a precipitation titration on a 1.00 L sample containing an unknown concentration of the cadmium ion, Cd2+. If it takes 24.52 mL of a 0.250 M solution of Na2CO3 to reach the end point, calculate the concentration of the cadmium ion?A 523.1-mg sample of impure KBr is treated with excess AgNO3 and 814.5 mg AgBr (187.774 g/mol) is obtained. What is the purity of the KBr (119.002 g/mol)?A 1.000-g sample containing bromide was dissolved in sufficient water to give 100.0 mL. A 50.00 mL aliquot was measured and after acidification, silver nitrate was introduced to precipitate AgBr, which was filtered, washed, and then dissolved in an ammoniacal solution of potassium tetracyanonickelate(II): Ni(CN)42- + 2AgBr(s) → 2Ag(CN)2- + Ni2+ + 2Br- The liberated nickel ion required 11.70 mL of 0.002146 M EDTA. The other 50.00 mL remaining solution was also analyzed for its Br- content by potentiometry using a metallic electrode of the second kind. e) Write the cell notation of the potentiometric set-up with SCE as the reference electrode. f) Write the Nernst equation that describes the indicator electrode set-up.
- A volumetric flask made of Pyrex glass is calibrated at 20 °C.It is filled to the 100 mL mark with 35 °C acetone. After the flask is filled the acetone cools and the flask warms so that the combination of acetone and flask reaches a uniform temperature of 32 °C. The combination is then cooled to 20 °C. a) What is the volume of the acetone when it is at 20 °C? b)At the temperature of 32 °C, does the level of acetone lie above or below the 100 mL mark?b) What is the function of using the following chemicals in the Determination of Zinc in Pharmaceutical Preparations by Ion Exchange Separation and Complexometric Titration experiment: Concentrated HCI, 1.5 M HCI, 0.5 M nitric acid, 4 M sodium hydroxide, 2 g of hexamine, methylthymol blue indicator and 0.01 M EDTA.Determine the weight/volume of the chemicals needed to prepare the following solutions: a) 100 ml of 0.9% (w/v) saline (NaCl) b) 30 ml of 50% glycerol (v/v) c) Electrophoresis requires TAE, which is a specific mixture of Tris base, acetic acid, and EDTA. TAE is normally made as a 50X concentrated stock. Provide a recipe to make 40 ml of 50X TAE. The recipe for one liter of 50X TAE is as follows: 242g Tris base, 57.1 ml glacial acetic acid, 100 ml 0.5 M EDTA
- A 1.00 g sample containing NaHCO3 was dissolved in water and titrated using 0.500 M HCI. The sample solution required 12.5 mL of the titrant solution to reach endpoint. Assuming that only NaHCO3 reacts with HCl, how much of NaHCO3 is present in the sample? g439 mL of 0.270 M hydrochloric acid is exactly neutralized with 0.920 M potassium hydroxide solution. What volume of base solution is required?The wavelength for cobalt (II) chloride is set to 549 nm. Why is this wavelength being used?
- A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO4 is added to the acid solution and the excess is titrated with 0.0220 M KMnO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO4 was added?The image shows a whole body bone scan using MDP (mono-diphosphonate) labelled with technetium-99m. Patient is injected with 600 MBq of Tc-99 MDP Technetium-99m is a pure gamma emitter, with physical half-life of 6 hours. a) Use the data to explain why technetium 99-m is a suitable radionuclide (AC 3.1) ● b) What other information would you need to assess the suitability of Technetium-99m as a radioactive tracer. (AC 3.1) Prompt questionsThe maximum allowable concentration of chloroform, CHCl3, in drinking water is 100 ppb. What is the maximum amount (in grams) of chloroform allowed in a glass containing 400 g (400 mL) of water?