The slides we looked at in class did not cover this question. I would appreciate your help! 5. Let's say naphthoic acid was isolated by vacuum filtration from our procedure explainedin the slides, and after washing with water and airdrying for 10 minutes, a weight andmelting point was taken. How would the values for weight and melting point differcompared to if the sample was allowed to dry overnight?

Both methods are useful for removing moisture. Vaccum drying is most effective and gentle drying…

Answered: 5. Let's say naphthoic acid was…

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter4: Recrystallization

Section: Chapter Questions

Problem 1Q

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Similar questions

What are the different melting point apparatus that are available for routine analysis? Describe each.
Write the dispersion medium and dispersed phase in milk.
Draw a FIVE STEP Schematic diagram of the procedure on how to separate pure crystals of CuSO4 , Alum and Benzoic acid. (Draw only ONE schematic diagram for the three samples)
1. Why is the washing of crystals on the filter paper not as effective a process of purification as crystallization?2. How do you account for the formation of crystals of different sizes in slow and rapid crystallization process?3. What properties should ideally be possessed by a recrystallization solvent?
- 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?
1. What is the limitation of the sublimation laboratory technique? 2. When can sublination be applied as a process of separation?
TRUE OR FALSE, if false then give the correct word to make the statement true then explain 1. Sublimation occurs when a solid has a relatively high vapor pressure at a temperature [above] its melting point. 2. To isolate the desired chemical, a single extraction is [more efficient] than extracting the compound numerous times. 3. The compounds are separated in liquid-liquid extraction based on their relative solubilities in two [immiscible] liquids.
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.
Which component(s) in the water-salt-potassium permanganate mixture is removed by distillation? Which test result confirms the removal of this component(s)? O a. Faintly colored water; it turns red litmus paper to blue O b. Water with potassium permanganate; the distillate is not colorless O c. Pure water; gives a negative result to the conductivity test O d. Water with dissolved salt; gives a positive result to the conductivity test
Select all of the options below that are used to increase the purity in the purification of crystals. Stirring the solution after mixing. O Filtering the crystals O Recrystallization at least once. O Slow cooling during crystallization. Heating the pure crystals Fast cooling during crystallization.
3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.
6. The following are disadvantages of using filter paper in gravimetry, which is not included? a. React with strong acids and strong bases b. Break under mild stress c. Ashless filter paper is used d. Prevent use of suction 7. Which of the following can not be used to minimize supersaturation and thus used to crystalline properties? а. Нeating b. Using dilute solutions c. Rapid addition of the precipitating agent d. Air control

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