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.
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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.
Step by step
Solved in 2 steps
- - Suppose your sample is mixed with other stuff that is not soluble in your recrystallization solvent. Whenfiltering, should you rinse with hot solvent or cold? Why? - Suppose you've isolated crystals of your sample and are now filtering them. Should you rinse with hotsolvent or cold? Why?A mixture of the two compounds shown below is dissolved in ether. Using the information given in the experiment, select all the correct statements regarding the extraction and isolation of the two compounds. lose 0000 X OH A. X can be extracted from the organic layer using sodium hydroxide. B. Y can precipitate out of the aqueous layer by the addition of sodium hydroxide to the salt of Y. C. X can precipitate out of the aqueous layer by the addition of sodium hydroxide to the salt of X. D. Y can be extracted from the organic layer using sodium hydroxide.Why is important to allow the saturated solution to cool down slowly during the recrystallization?
- 1. Explain the importance of using a thermometer in the simple distillation setup. 2. Enumerate the characteristics of a substance for it to be separated from the heterogeneous mixture by steam distillation. 3. How does steam facilitate the distillation of essential oils? 4. Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application. 5. What is the most dominant intermolecular forces of attraction that exist between: a. water and limonene, the major monoterpene component of lemon essential oil? b. water and constituent ions of sodium chloride? 6. Based on your answers in number 5, which pair (water-limonene or water-sodium chloride) exhibits a stronger attraction between their molecules/ions? 7. Describe what happens during the salting-out process in terms of the intermolecular forces of attraction involved as mentioned in your previous answers.3. Describe the characteristics that a crystal obtained through recrystallization must have, the final crystal, not the solvent.Give clear detailed Solution..please avoid handwritten Solution
- What physical property determines which solvent sinks to the bottom when performing a liquid-liquid extraction? A. Refractive Index B. Solubility C. Density D. Boiling PointExplain and elaborate how the following purification techniques work: a. Sublimation b. RecrystallizationWhich of these is NOT true of a good recrystallization solvent? Which of these is NOT true of a good recrystallization solvent? a) The compound is insoluble in the solvent when it is cold. b) The solvent boiling temperature is at least 40 °C. c) The solvent has many impurities. d) The compound is soluble in the solvent when it is hot.
- In distillation 1. What is the reason for discouraging the formation of bubbles inside the condenser?2. What is a fractionating column?3. How fractional distillation works?4. What are azeotropes?How was the precipitate obtained after filtration? a. By drying the precipitate on the filter paper using a desiccator. b. By charring the filter paper and igniting the product in a crucible. c. By redissolving in hydrochloric acidMany operations in the chemical laboratory use “salting out” in the procedure. What do the purpose of this technique?