Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Compare the three main purification methods (recrystallization, distillation, and extraction) by stating what
each one is best for.
each one is best for.
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- Why 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 compoundsarrow_forwardNonearrow_forwardhelp with two part questionarrow_forward
- The position of the phases in the separatory funnel (whether the top or bottom phase) is dependent on the relative densities of the solvents. Complete table 1 to indicate whether each of the solvents will be on the top or bottom layer. Table 1. Solubility properties of common organic solvents. Solubility in H20 (g/L, 20-25°C) 9.5 x 10-3 1.79 8.09 17.5 Solubility of H20 (g/L, 20-25°C) 0.31 Phase layer Density (g/mL, 25°C) 0.661 Liquid hexane benzene chloroform 0.76 0.87 1.76 15 170 0.877 dichloromethane diethyl ether 1-butanol 60.5 73 0.3 1.489 1.327 0.713 0.81 0.83 1-octanol 49 ethyl acetate 83 33 0.902arrow_forwardWhich of the following statements is true when considering temperature during a recrystallization? More than one answer may be correct. Using ice to cool the sample will speed up the crystallization process so that large crystals will be formed. It is important that the sample is dissolved in just enough hot solvent. O Ideally the hot solvent used will keep the impurities dissolved OR not dissolve them at all. Enough cold solvent should be added to dissolve the sample BEFORE heating it past its boiling point.arrow_forwardThe vapor pressure of pure water at 25 °C is 23.8 torr. Determine the vapor pressure (torr) of water at 25 °C above a solution prepared by dissolving 15.0 g of urea (a nonvolatile, non-electrolyte, MW = 60.0 g/mol)in 120. g of water. Group of answer choices 18.1 torr 22.9 torr 0.861 torr 2.64 torrarrow_forward
- 8. catalytic HCI water solventarrow_forwardIn general terms, please describe how to carry out a recrystallization. Just give the steps that should be used to recrystallize something.arrow_forwardExplain with detail some factors which must be considered when choosing a solvent to dissolve a solid powder.arrow_forward
- Show the complete solution.arrow_forwardWhat is brewing tea in water an example of? A. solid-liquid extraction B. liquid-liquid extraction C. none of the above D. recrystallization E. all of the abovearrow_forwardRank the solubility of the compounds in benzene from most soluble to least soluble.arrow_forward
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