3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H

Question

3. Which of these pairs of liquids is likely to be miscible? A. H,O and C,H B. H,O and CH,OH C. CH,COCH, and GaHh 4. Explain why water is a worse solvent for wax than carbon tetrachloride Wax 5. Explain how can it be spontaneous for a salt with an endothermic enthalpy of solution to dissolve? 6. A chemist dissolves NaOH in water and measures an increase in temperature of the solution as it dissolves. They dissolve NaCl in water and measure a decrease in temperature. Which of the following is a correct inference to make from this observation? Explain (more than 1 can be right). The lattice energy of NaOH is lower than the lattice energy of NaCI. The hydration energy of NaOH is higher than the hydration energy of NaCi The hydration energy for NaCl is larger in magnitude than the lattice energy The hydration energy for NaOH is larger in magnitude than the lattice energy The dissolution of NaOH is exothermic and the dissolution of NaCl is endothermic The lattice energy of NaCl is greater than the hydration energy and the lattice energy of NaOH is less than the hydration energy 7. A chemist is trying to predict which has a more endothermic enthalpy of solution, KBr or NaCI. Explain the process they would go through in order to predict this. The chemist has a table of lattice energies and hydration energies for ions. 8. A chemist is trying to predict which has a more endothermic enthalpy of solution, KBr or NaCI. Explain the process they would go through in order to predict this. The chemist has a periodic table only. 9. Here are isopropanol, isopropyl chloride, and isobutane. Rank their solubility in water from highest to lowest and explain. CH Cl 10. Rank the substances in 9 from highest to lowest boiling point. Explain.

Explanation / Answer

3. B and C pairs are miscible.

Explanation, optian A contains water and hexane which are not miscible due to opposite polarities. Water and methanol shown in option B are miscible due to hydrogen bonding. In option C we have acetone and hexane. Now acetane has a hydrocarbon like structure due to it's C-C-C backbone making it miscible in hexane. Although, the C=O bond of acetone is polar but the polarity is intermediate of water and hexane enabling it to dissolves both.

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