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8.
Organic solids are best purified by
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- In fractional distillation, liquid can be seen running from the bottom of the distillation column back into the distilling flask. What effect does this returning condensate have on the fractional distillation?Differentiate between simple distillation and fractional distillation. Please elaborate.Which is not required in recrystallization? a. solution is filtered at high temperature b. moderate volatility solvent c. saturated solution d. solvent must dissolve the impurities
- ………… is usually used only to separate liquids whose boiling points differ greatly or to separate liquids from involatile solids or oils. which option is correct?a. distillation b. simple distillation c. fractional distillationd. steam distillation e. vacuum distillationWhy is it important to know if a substance is a molecular compound or an ionic compound before predicting its effect on the boiling and freezing points of a solvent? Ionic compounds dissociate, resulting in more particles in solution, which affects the b.p. and f.p. Molecular compounds dissociate easier than ionic compounds, thereby having a greater effect on the b.p. and f.p. Ionic compounds have higher boiling points and lower freezing points than molecular compounds Ionic compounds have the opposite effect on freezing and boiling points than molecular compounds. Molecular compounds have greater intermolecular forces than ionic compounds Molecular compounds have a greater effect on the van't Hoff factor than ionic compounds45). A student hopes to dissolve 0.900 g of Pbl2 in pure water to make 1 L of solution. Will all 0.900 g of Pbl2 dissolve in pure water to make a 1L of solution as hoped by the student? a. All 0.900 g of Pbl2 will dissolve. b. Not all 0.900 g of Pbl2 will dissolve. c. This is way under saturation, so all 0.900 g of Pbl, will dissolve. d. Cannot be predicted
- 2. When preparing a non-aqueous alcoholic solution that is required to be free of water:a. What solvent is suitable for calibrating the bottle it is prepared or dispensed in?b. What solvent should not be used for calibration?6. In a recrystallization, why is it important to dissolve the solute in boiling solvent instead of cold solvent? a. To melt the solute b. To boil the solute c. To use as small amount of solvent to dissolve the solute as possible d. To chemically decompose the impuritiesWhat is fractional distillation and distillation with the use of a fractionating column; how it is performed, what is the theory behind it?
- How many milliliters of a 17% w/v concentrate of benzalkonium chloride should be used in preparing 150 mL of a stock solution such that 15 mL. diluted to 1 liter will yield a 1:5000 solution? A. 2 ml. B. 23.5 mL C. 11.75 ml. D. 0.2 mL1. Explain how distillation works in separating simple mixtures. 2. Differentiate simple distillation and fractional distillation. 3. What is an effective way of preventing irregular ebullition or bumping of the mixture during distillation?An unhnown brown liquid is unitorm throughout and con be futher Seperated by distillation The unhnown is... a.) element 6.) solution C.) a Lomponnd d.) heteropenous mixture not yet? ngest IMF #3.