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Recrystallization
The goal of the recrystallization procedure is to obtain purified material with a maximum recovery. For each of the following situations, explain why this goal would be adversely affected.
a) In the solution step, an unnecessarily large volume of solvent is used.
b) The crystals obtained after filtration are not washed with fresh cold solvent before drying.
c) The crystals obtained after filtration are washed with fresh hot solvent before drying.
d) A large quantity of decolorizing agent is used.
e) Crystals are obtained by breaking up the solidified mass of an oil that originally separated from the hot solution.
f) Crystallization is accelerated by placing the flask of hot solution in an ice-water bath.
The excess of acid needed 16ml of 0.25M Naoh for neutralization. then Calculate the percentage of calcium carbonate and magnesium carbonate?
Assume the density of the vinegar solution is 1.00 g/mL and 5.00% by mass acetic acid. Determine the volume of vinegar that can be neutralized with 25.0 mL of 0.100 M NaOH.
The molar enthapy of fusion for water is 6.008 kJ/mol. calculate the molar enthapy of vaporization of a substance if 0.652 mol of the substance absorbes 6.411 kJ when it melts.
At a certain temperature the equilbrium constant is 396 K for H2(g) + I2(g) ↔ 2HI(g) , Calculate the the equilbrium constant for 0.5H2(g) + 0.5I2(g) ↔ HI(g)
What is the maximum number of electrons that can be identified with each of the following sets of quantum numbers? In some cases, the answer may be "none."
Compute the number of mol of S represented by 1.810 x 10 -27 atoms of S, also determine the number of atoms of sulfur in 5.22 x 10 -7 kilograms of sulfur.
A nitric acid solution containing 71% HNO3 (by mass) has a density of 1.42g/mL. how many moles of HNO3 are present in 1.00L of this solution.
The Cl- is at equilibrium across the membrane while the protein is inside the cell and cannot permeate the membrane. Determine the concentration of Pr+/- (in M)?
How much heat is required to heat 10.0g of ice at -5.00 degree Celsius to become water vapor at 107.00 degree Celsius.
If the reaction N2(g) + 3H2(g) ! 2NH3(g) is carried out at constant temperature and pressure, how much H2 is required to react with 6.4 L liters of N2.
Using the reaction 2C6H6+15O2--->12CO2+6H2O, what volume of carbon dioxide will be produced when 128.0 grams of benzene react.
What mass of solid sodium formate (of MW 68.01) must be added to 110 mL of 0.55 mol/L formic acid (HCOOH) to make a bu?er solution having a pH of 3.84? Ka = 0.00018 for HCOOH
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