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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- Which is not required in recrystallization? a. solution is filtered at high temperature b. moderate volatility solvent c. saturated solution d. solvent must dissolve the impurities25. 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 spots1. 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.
- Which 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.Occasionally you will have solid impurities “trash” in your heated recrystallization solvent. How do you remove these impurities?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 Point
- 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?
- 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.What is brewing tea in water an example of? A. solid-liquid extraction B. liquid-liquid extraction C. none of the above D. recrystallization E. all of the aboveYou 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.