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1. Water and toluene are very good recrystallization solvents. Why is it not useful to use these solvents for a ‘quick' recrystallization?
2. Acetone, dichloromethane, and diethyl ether are widely used organic solvents. Why is their use as a recrystallization solvent not always a good choice?
3. Why must we be careful how much solvent we use when performing a recrystallization?
4. Why would we use activated charcoal in the recrystallization process?
5. Why can't we use vacuum filtration when filtering solid impurities from a hot solution?
6. Why must we cool the heated solution slowly to room temperature before placing it in an ice bath instead of just placing it in an ice bath to begin with when we are recrystallizing our solute?
7. What are some ways to induce recrystallization (Name 3), if your solute refuses to recrystallize after performing the required 7 steps?
A certain substance has a molar heat of vaporization of 31.6 kj/mol. How much of the sunstance is in a sample that requires 57 kj to vaporize.
Assume a density of 1.08g/mL for the solution. A)Find molarity of solution B)Find molality of solution C)Calculate mass percent of solution
Important information about Conceptual Organic chemistry and What chemical tests might be used to distinguish between pentanal and 2- pentanone; between benzyl alcohol and diphenylmethanol?
Write the balanced net ionic equations for the reactions that occur in each of the given cases as. Cr2(SO4)3(aq) + 3(NH4)2CO3 (aq) = Cr2(CO3)3 ( s) + 3(NH4)2SO4 ( aq).
A close chemical relative of the banned insecticide DDT is methoxychlor (C16H15Cl3O2). Methoxychlor is currently used as a home insecticide. Calculate the mass percent of oxygen in methoxychlor.
Calculate the equilibrium concentrations of NH3 and H2S if a sample of solid NH4HS is placed in a closed vessel and decomposes until equilibrium is reached
What characteristic absorption bands would you expect to find in the infrared spectrum of caffeine?
How reliable is the perfect gas law in comparison with the van der Waals equation? Calculate the difference in pressure of 10.00g of CO2 confined to a volume of 100cm3 at 25 degrees Celsius between treating it as a perfect gas and a van der Waals ..
What is the equation for the reaction of cyclohexene wtih MnO4- to form 1,2-cyclohexanediol and MnO2 in a basic medium.
What is the specific heat for the metal if It takes 48.0J to raise the temperature of an 8.60g piece of unknown metal from 13. Degree Celsius to 24.3 degree celsius?
A sample of fluorine gas occupies 855 mL at 710 mm Hg and 1550C. What is the mass of the sample?
The energy change, ?H, associated with the following reaction is +81 kJ. NBr3(g) + 3 H2O(g) → 3 HOBr(g) + NH3(g) What is the expected energy change
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