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A student was preparing to recrystallize a solid using mixed-solvent recrystallization. He planned to dissolve the sample in boiling methanol, and then add hot pentane to induce crystallization. the instructor told the student thay adding a non-polar solvent was a goog idea,but that pentane would be a very poor choice.
a- why would pentane be a poor solvent to use in this experiment?
b- suggest a good solvent to use insted of pentane.
calculate how many moles of KIO3 are needed to make 50 ml of 0.20 M solution?
You prepare a suspension by dispersing 20.0 g solid compound with the aqueous dispersant (outer phase of the suspension) to a final volume of 100.0 ml. The dispersant contains 10% w/v glycerol and 0.5% w/v polysorbate 80. The density of the solid ..
how much energy is required to turn 500 g of ice at -15.0 celsius to liquid water at 55.0 celsius? specific heat (ice) = 2.10 J/g * C. Specific heat (water)= 4.18 J/g*C
How many atoms of neon occupy a volume of 14.3 L at STP?
System conducts 1.30x10^2 cal heat to srroundings while delivering 316 cal work. What is the change in internal energy of the system (in Cal).
You decide to use gel filtration. This works brilliantly and you determine that your protein is 80kDa at the same time. But wait! The gene that corresponds to HMD predicts a protein of only 38kDa. What are two potential causes of this discrepancy?
A pound of coffee beans yields 30 cups of coffee (4 cups = 1 ). How many milliliters of coffee can be obtained from 1.0 of coffee beans.
hydrogen peoxide decays into water and oxygen in a first-order process at 20 degrees celcius. H2O2 yeilds H2O and 1/2 O2 the rate expression is 1.77X10 -5 [H2O2] what is the half life in hours of h2o2.
how many grams of methanol (CH3OH) is required to prepare a 0.112 m solution in 440 g of water? answer in units of g.
Describe the preparation of 1.5 liters of a 0.1 M acetate buffer, pH 5.0, starting from solid sodium acetate trihydrate
what is the condensed structural formula of 4-isopropylheptane?
Using the following data, calculate the standard enthalpy of reaction for the coal gasification process 2C(s) + 2H2O(g) --> CH4(g) + CO2(g).
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