Questions: 1. Which of the following would be a good solvent at room temperature

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Questions: 1. Which of the following would be a good solvent at room temperature for naphthalene, C:oHg? Water, ethanol, or pentane 2. Would your solvent be also a good recrystallizing solvent? Why or why not? 3. Describe a procedure to solve the following problems: a) no crystals are formed when solution reaches room temperature b) oiling out c) presence of colored impurities d) presence of insoluble impurities e) loss of product due to premature crystallization on the fluted filter paper when doing a gravity filtration 4. Below is a solubility table for an unknown organic solid. The solid is white with a m.. of 75°C. Which solvent would you use for recrystallization? Explain your choice. solvent solubility at b.p. solvent solubility at 25°C insoluble insoluble soluble soluble soluble soluble 100 °C 65 °C 56 °C water methanol acetone partially soluble diethyl ether soluble 35 C 5. The solubility of phthalic acid in water is 0.54 g/100 mL at 14°C and 18 g/100 mL at 99 What is the smallest volume of boiling water that should be used to recrystallize 600 mg of phthalic acid from hot water? 6. You will have to recrystallize many compounds throughout organic I and I. Write a short procedure on how you would do a simple recrvstallizationing hot gravity filtration involved). This should be only a paragraph at most. Assume you know which sovent to use but not the solubility of that compound in the solvent. simple testalizationLna hot Etut n th solubility of that compou

Explanation / Answer

Ans 1 :

Naphthalene is a covalent moelcular compound . Since like dissolves like , it is insoluble in water ,and somewhat soluble in ethanol. The best solvent amongst the given choices is pentane , as it is a carbon containing organic compound.

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