6. In gravimetric analysis, an ideal precipitating agent should i) React specifically or at least selectively with the analyte. ii) React rapidly with the analyte. iii) React completely with the analyte iv) All the above.
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- 1. Differentiate the Faians method from the Volhard method of precipitation titrimetry, Include key information such as indicator used, endpoint, analytes, and the chemical reactions.True or False Very Insoluble precipitates are not the best candidates for gravimetric analysis.9. An aqueous solution of sulfuric acid is prepared by mixing a secondary standard of sulfuric acid with deionized water. The aforementioned acid is to be used as a titrant hence its concentration must be accurately determined. To do this, Engr. Polinar, standardized the titrant by titrating two liters of ammonia at 0.90 atm and 30 deg C. From the experiment, 134 mL of the titrant was necessary to neutralize the ammonia. Determine the concentration of the acid in terms of normality? 10. Engr. Forcadela is optimizing a plastic formulation by manipulating the phosgene concentration injected as a gas during the reaction. To obtain credible results, he considered the propensity of phosgene to dissociate into carbon monoxide and chlorine gas at 395 deg C. Performing an experiment at the aforementioned temperature, an equilibrium is reached amongst the species where the total pressure is at 3 atm. If the equilibrium constant expression in terms of concentration for the reaction at 395 deg C…
- 1. (a) What are the requirements that should be met for a precipitation reaction to serve as the basis of a gravimetric method? (b) What is "digestion"? In what ways can digestion improve the quality of an analytical precipitate? (c) A typical thermogravimetric curve for magnesium oxalate (MgC:O.) precipitates is given below. 18 134 226 398 478 900 Temperature, C Describe the weight loss as a function of temperature. Select a suitable ignition temperature for the gravimetric analysis of magnesium. Explain your choice. i. Predict the possible composition of the residues collected at the chosen temperature, i.(3). Write short notes on displacement titration with suitable example.1.In using a burette, why is it important (a) to rinse it with a little of the solution it is going to contain, (b) to clamp it vertically, (c) to have the part below the tap full? 2. The following procedures were carried out during the titration: (a) The sides of the conical flask were washed down with deionized water. (b) The conical flask was frequently swirled or shaken.
- 1. Which among these is/are desirable properties for the type of precipitate required in gravimetric analysis? I. large particles III. known composition A. I only II. reactive with atmospheric constituents IV. small particles C. I & III В. I & II D. III & IV Е. I, П, IWhy are many ionic precipitates washed with electrolyte solution instead of pure water?A sample containing BaCl, 2H,0, KCI and inert material weighed 0.8417 g. After heating the sample at 160°C for 45 min, it weighed 0.8076 g. The sample was then dissolved in water and treated with a slight excess of AgNo,. The resulting precipitate was collected and found to weigh 0.5847 g. Calculate the % Bacl,-2H,0 and % KCI in the sample. 3.
- Gravimetric Analysis. Please include complete solution, thank you. In the gravimetric determination of sulfate in a 0.2841 g sample of pure Na2SO4, a BaSO4 precipitate weighing 0.4604 g was obtained. The weight of the precipitate was smaller than the theoretical one, since some BaSO4 was converted to BaS during the heating process. Calculate the percent of BaS in the precipitate and percent error of the analysis.D. Water Softening 1.For this part of the experiment, watch the video on the link(s) below: https://www.youtube.com/watch?v=jDgSohKVLio Question: Comparison between the relative amount of precipitates for soft vs. hard water. Comparison between the relative amount of bubbles for soft vs. hard water.A sample is known to contain about 20% soda ash. What sample size should be taken for analysis, if it is to be dissolved into a 50 mL volumetric flask, with 10 mL aliquots analyzed, if it is desired that the analysis consume a total of 40 mL 0.10 M HCl with 10 mL of 0.10 M NaOH used in the back-titration, after boiling.