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Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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1. If my melting point range of my recrystallized materal is from 118-125 degrees Celsius, what does this tell me about the purity of my recrystallized material?
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- After the ethyl acetate is evaporated, Q and R (a mixture of liquids) remain. A) What criteria does this mixture have to satisfy to be separated by simple or fractional distillation? Homogenous or Heterogeneous B) What kind of distillation would you carry out? Fractional or Simple C)What reason(s) would make the mixture suitable to be separated using the distillation chosen in (b)? A) boiling point difference only B) boiling point difference and composition C) composition onlyarrow_forwardGiven a solid sample that contains impurities, how would you determine which solvent to use for recrystallization? Describe how you would do this in the laboratory.arrow_forwardQuestion 1. a) You think that you have isolated a substance A in the lab. It melts at 75 – 77C. Since you don’t totally trust your own laboratory techniques, you wish to prove that you have substance A. Using only melting point techniques, explain how you can prove that you actually have this substance. b) List and explain how solubility is a factor throughout crystallization/recrystallization. c)Explain aspects of melting point as it is related to substance identityand substance purityarrow_forward
- 3. A pure white crystalline compound was found to melt at 131.5-132.0°C when taken on a melting point apparatus, and on further heating, the liquid was found to start bubbling at ca. 155-160 °C. The capillary containing the melted compound was set aside to cool, and resolidify. When the sample was retried using that same capillary, the sample melted at 120.6-154.5°C, along with some bubbling. What is the cause of the bubbles? Why is the melting point so wide the second time? Explain by stating what you have learned in this laboratory about melting points.arrow_forwardWhat is different about steam distillationarrow_forwardwhat is the purpose of steam distillation? and what are the factors involved ?arrow_forward
- in fractional distillation, how do you tell which liquid is in which fraction and which fraction has a mix of liquids if you are trying to seperate cyclohexane and toluene?? what would the density and boiling point of the first fraction bearrow_forwardBased on the melting point of your impure solid, you look at the given samples and believe you havecompound A. Compound A is recrystallized using a mixed solvent system of ethanol and water. You add1 ml of hot ethanol to your sample and it doesn’t completely dissolve. You continue to add hot ethanolbut there isn’t any change. Some solid remains. What should you do next?arrow_forwardThe answer to c is 1.58g. Please answer question on bottom.arrow_forward
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