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1. What is the main goal of the recrystallization process? 2. Water and toluene are very good recrystallization solvents. Why is it not useful to use these solvents for a ‘quick' recrystallization? 3. Acetone, dichloromethane, and diethyl ether are widely used organic solvents. Why is their use as a recrystallization solvent not always a good choice? 4. Why must we be careful how much solvent we use when performing a recrystallization? 5. Why would we use activated charcoal in the recrystallization process? 6. Why can't we use vacuum filtration when filtering solid impurities from a hot solution? 7. 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? 8. What are some ways to induce recrystallization (Name 3), if your solute refuses to recrystallize after performing the required 7 steps?
Ba(OH)2 is dissolved in 100 grams of water at 90 degrees celsius until the sloution is saturated. If the solution is then cooled to 45 degrees celsius, how many grams of Ba(OH)2 will precipitate out of the solution?
A mixture consists of 323 mg of methane, 165 mg of argon, and 223 mg of nitrogen. The partial pressure of nitrogen at 275 k is 19 kPa.
Elemental exonium (not a real element) consists of two major isotopes
How much heat (in kJ) is evolved in converting 1.00 {mol} of steam at 160.0C to ice at -45.0C? The heat capacity of steam is 2.01 J/g*C and of ice is 2.09 J/g*C.
how many moles of ethylene glycol should be added to the radiator to lower the freezing point of the water from 0 degrees celcius to -18 degrees celcius?
A rigid container of O2 has a pressure of 340 kPa at a temperature of 713 K. What is the pressure at 273 K?
What is the pH of a solution obtained by adding 75.0mL of 0.366M CsOH to 250.0 ml Ba(OH)2 solution with a pH of 11.65.
One method of estimating the temperature of the center of the sun is based on the assumption that the center consists of gases that have an average molar mass of 2.00 g/mol.
Multiple choice questions in free energy change and What is the free energy change in kJ/mole?
Cyclic Alkyne reaction with KMnO4 and O3, Molecule 1: 5 carbon ring, carbon 1 has a carbon attached which also is triple bonded to another carbon (this end carbon just has a H attached.)
How many atoms of neon occupy a volume of 14.3 L at STP.
CaCN2 + 3 H2O → CaCO3 + 2 NH3 . How much CaCO3 is produced if 47.5 moles NH3 are produced?
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