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In gravimetric analysis, volatile solvents are used _______.
- to rinse the precipitate and remove adsorbed surface impurities
- because they can be obtained in a purer form than aqueous solvents
- because they are easily removed from the precipitate by ignition
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- mass Br- = 5.32 * 103* 79.904 = 0.4255 g. Os : What concentration Of Fez(SO4)3 (aq) is required for the olution to have [Fe*3 lag)] = 0.32M ? ) 0.16 M. %3D 0.080 M. 0.32 M.2. In one gravimetric analysis, the aluminum in a 1.2g sample of impure NHAI(SO4)2 was precipitate as hydrous ALO3.XH2O. The precipitate was filtered and ignited at 1000 °C to give anhydrous Al2O3 which weighed 0.1798g. Calculate the % Al inthe sample. 3. A sample of 0.4500g impure potassium chloride was dissolved in water treated with excess silver nitrate solution. 0.8402 g of silver chloride was precipitated. What is the percentage of potassium chloride in the sample?QUESTION 4 To prevent inclusion from occurring during precipitation, the technique to follow is I. fiter precipitate with less porous paper II. crystal growth be made to occur more slowly III. use of dilute analyte with concentrated precipitant IV. addition of soluble electrolyte O lonly IV only O I| & IV O I & III Il only
- 1. Straight lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO): Estimate the lime dose (in mg 1.) required to soften the water. HCO 155mg/1 Ca 210 mg Mg-15mg/1 Alk.-260 ml Temp-10C 2. Excess lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO)). Estimate the lime dose (in mg/L.) required to soften the water.. H:CO 155mg/1 Ca 180 mg/1 Mg-60mg/1 Alk. -260 mg/1 Temp-10C...before addition of solvent - ▪ What are two methods of extraction A)liquid-liquid, Solid Phase Extraction B)solid-solid, Gas phase ▪ C)evaporation, derivatization8. The process by which a diverse ion gets trapped by a growing precipitate particle but does not become part of the crystal lattice A. occlusion В. adsorption C. post-precipitation D. inclusion
- Determine the solubility of Ag2SO3 (Ksp=1.5x10-14; MW=295.8 g/mole) in a 0.2 M solution of Na2SO3.Please help me out with making flowchart with thes steps. Write the result. 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 the centrifuge 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 each centrifuge 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 in each sample. 5. To the centrifuge containing…If Vsu= Vorg, how many times should the extraction process be repeated in order for 1 g of substance with KD= 2.25 to pass 90.5% to the organic phase?
- iii) Upon cooling the filtrate from step il, some tiny crystals appear in the filtrate. Addition of a few drops 1M K₂CrO₂ produces al yellow precipitate confirms the presence of: Ag ●Pb²+ O Pb² and Hg₂2 H₂21. What is used to change the chemical form of some precipitate that do not have a constant composition after drying? 2. If 2.376 g of steel gave 0.402 g Ni(DMG)2, what is the wt. % Ni in the steel? (Express your answer to 4 significant figures.) MMNi = 58.69 MMDMG = 116.12 MMNi(DMG)2 = 288.91Determine the concentration of Pb2+ in solution w/ 0.040 M NANO3 that's satured with PbCl2 . (Ksp, PbCl2 = 1.66 x 10-5 ). (Determine w/ activties)