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What are desirable properties of a gravimetric precipitate?
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- cite literature that gravimetric analysis is used to test the purity of any soup productWhat is precipitation from homogeneous solution; what are the benefits of this method.A 12.63 g sample of calcium ore was dissolved in HCl and gravimetrically analyzed, through the precipitation of calcium into CaC2O4 · H2O. The precipitate was filtered, washed, dried, and ignited at 500 oC until the weight was constant, giving a final mass of 2.35 grams pure CaCO3 (100.087 g/mol). Calculate the % Calcium (40.078 g/mol) in the sample.
- 148. Addition of 50.00 mL of 2.238 m H2SO4 (solution density = 1.1243 g/mL) to 50.00 mL of 2.238 M BaCl2 gives a white precipitate. (a) What is the mass of the precipitate in grams? (b) If you filter the mixture and add more H2SO4 solution to the filtrate, would you obtain more precipitate? Explain.10. A student analyzed a limestone sample but forgot to dry it. He found 31.20% CaO, whereas the correct value was 31.60. If the error was caused by the failure to dry the sample, what percentage moisture did the sample contain? 11. A 0.8000-g sample of iron ore containing 21.00% Fe is analyzed gravimetrically. If the final precipitate (assumed to be Fe,03) contains 20.0 mg of Al,O3 by mistake, what percentage of Fe does the analyst find?Why are many ionic precipitates washed with electrolyte solution instead of pure water?
- A newly-discovered iron ore was examined to determine percent iron in the ore gravimetrically. 5.408 grams of the ore samples was subjected to gravimetric analysis and precipitated as iron (III) oxide and dried at 105 degrees Celsius. What is the percent iron contentn of the ore if the mass of the precipitate is 0.3785 grams?Why is recrystallization not applicable to samples which contain large amount of impurities?Six 50.0 ml volumetric flask 1 through 6 are labeled. 10.00 ml of 2.00 x 10-1 M Fe(NO3)3 solution was then pipet into each volumetric flask. A 1.00,2.00,3.00,4.00 and 5.00ml of 2.00 x 10-3M NaSCN solution was then pipetted to flask 2 through 6 respectively. A sufficient amount of 0.10 M nitric acid was then added to each flask to make each a total volume of 50.00ml. Hint M1V1=M2V2 a)what would be the concentration of Fe(NO3)3 in 0.10M HNO3? b)what would be the concentration of NaSCN in 0.10M HNO3?
- Briefly describe the principles for separating the components of a mixture by solvent extraction.When treating a mixture of metals( copper and zinc) with an excess of solution of hydrochloric acid, 2.24 liters of a gas(STP) were released. When the same mixture was treated with phosphoric acid precipitate of 93.5g is formed. Find the mass fraction of metals in the initial mixture.Which of the following statements is true? A Liquids can be weighed using a weighing paper. B In weighing hygroscopic substances, containers should always be kept close when not in use. CAfter drying a sample in the oven, you can place it immediately inside the analytical balance. D Place solid reagents / precipitates directly on top of the balance pan.