1. A process where impurity is precipitated along with the desired product. 2. Calculate the gravimetric factor for: Analyte: SiO2 Precipitate: KAlSi3O8
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1. A process where impurity is precipitated along with the desired product.
2. Calculate the gravimetric factor for:
Analyte: SiO2
Precipitate: KAlSi3O8
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- Which statement is true? Statement 1: The two phases in the liquid/liquid extraction are aqueous layer and organic layerStatement 2: The distribution coefficient is the ratio of the equilibrium concentrations of the analyte in the two immiscible liquidsA pain reliever is soluble in cold water to the extent of 1.0g/1310 mL and soluble in diethylether to the extent of 1.0/90 mL. What is the approximate distribution coefficient?If 30.0 mL of water that is 0.0500 M in Q is to be extracted with four 10.0-mL portions of an immiscible organic solvent, what is the minimum distribution coefficient that allows transfer of all but the following percentages of the solute to the organic layer: (a) 1.00 X10-24 (b) 1.00 X10-22
- A 0.6025 g sample was dissolved and the Ca2+ and Ba2+ ions present were precipitated as BaC2O4.H2O and CaC2O4.H2O. The oxalates were then heated in a thermogravimetric apparatus leaving a residue that weighed 0.5713 g in the range 320oC to 400oC and 0.4674 g in the range 580oC to 620oC. Calculate the percentage Ba in the sample.A 25.00 mL sample of an aqueous solution Y is extracted with 50.00 mL of hexane. After extraction, it was found that 94.12% of solute Y was successfully removed from the aqueous solution. Calculate: i. The distribution constant for this separation The initial concentration of Y if 1.77 mmol Y remains in aqueous solution after extraction. iii. The concentration of Y in BOTH phases after extractionOn the direct iodometric titration experiment, Standardization of Na2S2O3 with KIO3 standard solution, why is it better to replace with iodine solution and HCl(as a catalyst) to make safer solvent and auxiliaries( reduced toxic waste)? explain why should we use iodine solution and HCl(as a catalyst) instead of Na2S2O3 with KIO3 ?
- Calculate the percent error in Avogadro's number calculated by using the following experimental data. Pipette calibrated as 30 drops/mlDiameter of the watch glas:15.5 cmNumber of drops to complete monolayer:23Concentration of stearic acid solution: 1.2x 10^-4g/ml.If 30.0 mL of water that is 0.0500 M in Q is to be extracted with four 10.0 mL portions ofan immiscible organic solvent, what is the minimum distribution coefficient that allowstransfer of all but 1.00 x 10–4 of the solute to the organic layer.Dissolved 0.273 grams of pure sodium oxalate (Na2C204) in distilled water and added sulfuric acid and titration the solution at 70 °C by using 42.68 ml of KMNO4 solution and has exceeded end point limits by using 1.46 ml of standard oxalic acid (H2 C204) with 0.1024 N. Calculate the normlity of KMNO4. Note that the molecular weight of sodium oxalate (Na2C204) = 134 and its equivalent weight = 67 * %3D
- In gravimetric analysis, co-precipitation occurs alongside with analyte precipitation,resulting in the introduction of impurity and excess mass. Occlusion and inclusion areamong the sources of impurities. Distinguish the difference between occlusion andinclusion and compare them using diagramsBetnovate-RD® contains 0.025% w/w betamethasone valerate in a water-miscible basis. How much betamethasone valerate is contained in a 100g tube?The analgesic aspirin is soluble at 25oC in water to the extent of 3mg/mL and in ethylacetate to the extent of 86 mg/mL. The approximate distribution coefficient of aspirin in these two solvents is __