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- Why are many ionic precipitates washed with electrolyte solution instead of pure water?While working in a metal processing facility, Letlen had accidentally mixed two metal vatstogether creating an alloy. One vat was labeled for cadmium, while the other was not. It canbe assumed that these are of pure metal composition. To identify this metal, Letlen took 1.000 g of the homogenous alloy sample composed ofcadmium and the unknown metal, dissolved, and diluted it to exactly 100.0 mL in avolumetric flask. A 20.00-mL aliquot was taken and titrated this using 22.82 mL of 0.05000M EDTA. In a second 20.00-mL aliquot, the Cd was masked through the addition of HCN/NaCN buffer.The titration of the unknown metal in the aliquot required 15.13 mL of EDTA.MW: Cd (112.411 g/mol) a. Calculate the moles of Cd and the moles of unknown metal in the 20.00-mL aliquot.b. Calculate the moles of Cd and the moles of unknown metal in the sample.Why a filter paper cannot be utilized for the removal of potassium permaganate precipitate?
- How do you choose the most suitable precipitate for gravimetric purposes if given many choices?List the steps required in gravimetry to prevent impurities in the final precipitate.Please show COMPLETE solution.Which among these is/are properties for the type of precipitate required in gravimetric analysis? Hygroscopic Known composition Reactive with atmospheric constituents Large particles
- How to prepare these solutions? 250.0 mL 0.125 M stock Na2S2O3 solution from Na2S2O3·5H2O crystals 250 mL 0.10 M NaOHNOTE: Use the 1.0 M NaOH prepared250.0 mL standard 2500 ppm Cu(II) stock solutiona. Weigh and dissolve appropriate amount of Cu(NO3)2·5H2O crystals in enough distilled water.During the preparation of viscose rayon, cellulose is dissolved in a bath containing sodium hydroxide and later reprecipitated as rayon using a solution of sulfuric acid. Name the salt that is a by-product of this process. Rayon production is, in fact, a significant commercial source forthis salt.Firstly, What is the final molar concentration of a 500.0ml solution prepared from 15.0 ml of a 12.0 M solution of sulfuric acid? Secondly, solid potassium permanganate and standard laboratory equipment are available. Briefly describe how you prepare 100.0 ml solution of 0.050 M potassium permanganate? Potassium permanganate Mr= 158.03 g mol-1 Thirdly, are methonal (CH3OH) and acetic acid (CH3COOH) expected to be miscible? explain with reasoning
- The total cation content of natural water is often determined by exchanging the cations for hydrogen ions on a strong acid ion-exchange resin. A 25.00 mL sample of a natural water was diluted to 100.00 ML with distilled water, and 2.06 g of a cation - exchange resin was added. After stirring, the mixture was filtered and the solid remaining on the filter paper was washed with three 15.00 mL portions of water. The filtrate and washings required 16.30 mL of 0.0282 M NaOH to give a bromocresol green end point. a) Calculate the number of millimoles of cation present in exactly 1.00 L of sample. b ) Report the results in terms of milligrams of CaCO3 per liter. Only typed solution.Which of the following conditions would lead to an increase in the relative supersaturation of a solution during precipitation gravimetry? a. decrease in temperature b. slow addition of precipitating agent c. precipitation from a hot solution d. vigorous stirringdescribe how you can prepare 500mL of 0.10 M Fe2O3 (159.69g/mol) from the primary-standard-grade solid.