Define why slow cooling tends to give better crystals

Reference no: EM13680316

1. Presume you dissolve a compound in too much solvent in a recrystallization. Explain how would you find out that you had used too much solvent? Specified that too much solvent has been used what can you do about it?

2. Presume a Craig tube assembly has been chilled in an ice bath. Explain why must the filtration step be performed quickly?

3. Acetanilide has an mp of 114 degrees C yet it apparently melts in boiling water. Explain.

4. Explain why is it necessary to dry the purified acetanilide before taking a melting point?

5. Define why slow cooling tends to give better crystals in a recrystallization than the crystals obtained upon rapid cooling.

6. A compound is soluble in ether at room temp. However not very soluble at -80 degrees C (Dry Ice temp). Would either be a useful crystallization solvent for the compound? Explain.

Reference no: EM13680316

Questions Cloud

Compute benzene concentration : Hold up time was 0.25 min Split vent flow was 78 ml/min. Compute benzene concentration which will give you the same response on the same system with 1ul splitless injection. Explain

Compute the concentration of io3 : Compute the concentration of IO3- in a 5.92 mM Pb(NO3)2 solution saturated with Pb(IO3)2. The Ksp of Pb(IO3)2 is 2.5 × 10-13. Presume that Pb(IO3)2 is a negligible source of Pb2 compared to Pb(NO3)2.

Define a greater preference for the equitorial position : Bromine is larger than chlorine however the equilibrium constant indicates that a chloro substituent has a greater preference for the equitorial position than a bromo substituent does. Propose an explanation for this fact.

Explain the geometry shape around a carbon atom : Explain the geometry shape around a carbon atom which has one double bond as well as two single bonds to its neighboring atoms. Explain what is the approximate angle between any two of these bond directions

Define why slow cooling tends to give better crystals : Define why slow cooling tends to give better crystals in a recrystallization than the crystals obtained upon rapid cooling.

Explain what is the percentage of vitamin c in the tablet : Ten milliliters of this solution is after that diluted to 250mL. The absorbance of the solution is 0.241 in a 1cm cell. Explain what is the percentage of vitamin C in the tablet. The molar absorptivity is 7415.

Define what is the molar concentration : An aqeous solution of oxalic acid is 0.688m, H2C204. Explain the density of the solution is 1.022g/ml. Define what is the molar concentration

Explain the molecular mass of 16o is 15.995 g/mole : The intermolecular distance of CO is 113.1 pm. the molecular mass of 12C is exactly 12 g/mol. Explain the molecular mass of 16O is 15.995 g/mole. Find out the value of the rotational energy of 12C16O molecule described by J=0 and by J=1.

Compute the reduced mass of 12c16o molecule : The molecular mass of 12C carbon-12 is exactly 12 g/mole. The molecular mass of 16O (oxygen-16) is 15.995 g/mole. Compute the reduced mass of 12C16O molecule.

User Account

All Pages