What should you do if there are insoluble impurities after heating up your sample in the recrystallization solvent? a. Add more solvent to dissolves the impurities. b. Gravity filter the hot solution. c. Pick out the insoluble particles with a spatula. d. none of the above.
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What should you do if there are insoluble impurities after heating up your sample in the recrystallization solvent?
a. Add more solvent to dissolves the impurities.
b. Gravity filter the hot solution.
c. Pick out the insoluble particles with a spatula.
d. none of the above.
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- 25. In the paper chromatography experiment on food dyes, salt water was used as the A. mobile phase B. stationary phase C. eluent D. solute E. sample spotsWhich is not required in recrystallization? a. solution is filtered at high temperature b. moderate volatility solvent c. saturated solution d. solvent must dissolve the impuritiesWhich 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.
- 1. Flame Test a. Put 1 tsp of barium chloride in a clear dry watch glass. Gently add 2 to 3 drops of concentrated hydrochloric acid. b. Heat a piece of nichrome wire over an alcohol lamp until the flame is no longer colored. c. Dip the nichrome wire in the mixture containing barium chloride. d. Hold the wire at the edge of the flame. e. Record the color emitted after a few minutes. f. Clean the nichrome wire, repeat steps a-e, using calcium chloride, copper (II) sulfate, potassium chloride, and sodium chloride, respectively. 2. Test for Cu+2, Fe +3, Pb+2, Zn +2 a. Place 2 mL solution of copper (II) sulfate, iron (III) chloride, lead nitrate, zinc sulfate, and iron (II) sulfate in separate test tubes. b. Add 4 to 5 drops sodium hydroxide solution to each solution. Observe. c. Repeat step a. d. Add 4 to 5 drops ammonia solution to each solution. Observe.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 PointOccasionally you will have solid impurities “trash” in your heated recrystallization solvent. How do you remove these impurities?
- Make a Flow chart diagram of the PROCESS OF RECRYSTALLIZATIONYou will be completing the extraction of caffeine with dichloromethane and water. In which solvent will the caffeine be found after the layers are mixed, and is this the top or bottom layer? A. Dichloromethane - top layer B. Dichloromethane - bottom layer C. Water - top layer D. Water - bottom layerIs recrystallization a good method for purifying any product?
- You perform a recrystallization of biphenyl, but when you cool the solution, no crystals form. What is the most likely explanation? a. The solution was cooled too quickly. b. The solution was cooled too slowly. c. Too much hot solvent was added to dissolve the solid. d. Too little hot solvent was added to dissolve the solid.Chemistry Which lab technique(s) can be performed on solid, somewhat soluble samples? Melting Range Determination or Recrystallization. Melting Range Determination. Not Recrystallization. Neither Recrystallization nor Melting Range Determination. Recrystallization. Not Melting Range Determination.Assignment: This is an individual activity. After studying the lesson and watching all the videos, answer the following questions. Answer in not more than 3 sentences per question. 1. Discuss the a) direct method of weighing b) indirect weighing using the analytical balance. 2. Explain how suction filtration is carried out in the laboratory. Give the important points that must be observed in doing the process. 3. Explain why it is important to wash the precipitate. Can distilled water be used to wash all types of precipitates? 4. Discuss how to use a desiccator. When should a desiccant be replaced?