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1. When doing a recrystallization using a buchner funnel, explain what happens to the impurities that are more soluble than your compound in the solvent used?
2. When doing a recrystallization, why is it significant to allow the saturated solution to boil for ~1 minute and cool SLOWLY to room temperature before placing it in an ice-water bath?
3. If a substance is impure, explain what will be the two effects on its melting point compared to the literature value?
how many grams of caffeine c8h10n4o2 are present in one cup of coffee that contains 8.98 times 1021 caffeine
The flask was then shaken until the solution was uniform. A 60.0ml- sample of this glucose solution was diluted to 0.500 L . How many grams of glucose are in 100.ml of the final solution?
Concentrated acetic acid is 17.5 M; vinegar is 0.87 M acetic acid. How much concentrated acid do you need to make 24 L of vinegar? Use the equation c1V1=c2V2 (where c = concentration and V = volume)
Each carbon-oxygen bond is somewhere between a single and a double bond. 3.Each oxygen atom has a double bond 50% of the time 4. The actual structure of formate is an average of the two resonance forms
The vapor pressure of pure water at 25C is 23.8 torr. A solution is made by mixing 18.52g of an unknown non-ionic substance into 200.00g of water and the vapor pressure of the solution is found to be 23.3 torr. What is the molecular weight of the ..
If the width of a spectral line of a certain electronic transition is 1.00 cm-1, what is the minimum uncertainty in the lifetime of the transition?
What will happen to the H2O when equilibrium is reestablished after the following stresses are applied. a. temperature is applied
Include on the graph the boiling points of pure benzene and pure methanol and the boiling point of the azeotrope. Describe the behavior for a mixture that is initially rich in Benene (90%) and then for a mixture that is initially rich in methanol ..
Give explanation why the boiling point of a 2-component mixture increase slowly throughout a simple distillation while the boiling point differences are not large?
a sample of nitrogen gas occupies a volume of 3.87 liters at 52.8oc and 2.11 atm. what will the new temperature in degc
What is the concentration of the vitamin C standard solution? Using a balance, 125mg of Vitamin C was weighed out and was added to a 100-mL beaker and dissolved in 50mL of DI water.
An air sample contains 0.034% . If the total pressure is 765 , what is the partial pressure of
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