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- Why is the titration done with vigorous swirling?How will the calculated molarity of the solution be affected if solid particles splatter out of the flask during the drying process? Explain. How will the calculated molarity be affected if the solute residue is not dried thoroughly? Explain.Why are ice and water added to the reaction mixture after the reaction was completed? A. To increase the volume of the solution.B. To deprotonate the intermediate to form the productC. To protonate the intermediate to form the productD. To dilute the solution before filtration to avoid that the filter paper to dissolve
- Purification of benzoic acid 1. What is the purpose of washing the crystal in the filter paper with water? 2. How recrystallization affects the theoretical yield of sample? Explain.Which of the following could result in a loss in yield in a mixed solvent recrystallization? i. Use of fluted filter paper in hot filtration ii. No heated solvent in the receiving flask iii.Rapid cooling iv. Both ii and iiiBriefly explain why should the flask be stoppered after the addition of KI in the standardization of sodium thiosulfate VS.
- If 80% of a desired compound is extracted into the organic phase in each step (leaving 20% in the aqueous layer), how many extractions are necessary to ensure that at least 99% of the compound has been recovered in the organic phase? 1 extraction 2 extractions 3 extractions 4 extractions1,4‐Dimethoxybenzene (0.642 g) was dissolved in 2.0 mL acetic acid in a 25 mL Erlenmeyer flask using heat from a hot plate. Once the solid dissolved, 1.0 mL tert‐ butanol was added, and the reaction mixture was cooled in an ice bath. Then 2.0 mL concentrated sulfuric acid was added in 2‐3 drop portions,stirring the mixture after each aliquot. After the addition, the flask was removed from the ice bath and allowed to sit at room temperature for 15 minutes. Then 1.0 mL water was added dropwise to dilute the acid and the reaction mixture was added to 40 mL cold water in a 100 mL beaker. The solid was vacuum filtered and washed with 5 mL cold water, giving 52 g filtrate. The product wasrecrystallized from 4.5 mL methanol, yielding 0.317 g purified 1,4‐di‐tert‐butyl‐2,5‐dimethoxy benzene (27.2% yield). What is the atom economy, e-factor, and effective mass yield?Imagine your original mixture had contained a component capable of sublimation, such as naphthalene. When would be best time to remove this volatile component so the other procedural steps would still work: before step (1), after (1), after (2), or after (3)? Why? How could the volatile component then be collected as a solid?