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a. What advantages does ligroin have over n-pentane as a recrystallization solvent?b. What advantages foes ethanol have over n-octanol as a recrystallization solvent?
Calibration of a glass electrode gave a reading of 148.7 mV with 0.05 m potassium dihydrogen citrate buffer standard (pH = 3.766) and a reading of -167.4 mV with 0.01 m borax buffer standard (pH = 9.139), both measured at 30°C.
From data below, calculate the total heat (in J) associated with the conversion of 0.499 mol ethanol gas (C2H6O) at 301°C and 1 atm to liquid ethanol at 25.0°C and 1 atm.
CaCO 3 ( calcium carbonate ) is insoluble in water. would this ionic compound conduct electricity. why/why not.
How does C 10 H 12 O 2 eugenol combine with Br bromine in CCl 4 carbon tetrachloride and concentrated H 2 SOP 4 at the temperature of 20 degrees Celsius?
A 12.4 g sample of CaCl2 is dissolved in 112 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C·..
draw a qualitative potential energy diagram for the rotation about the c3-c4 bond in 2,4-dimethylpentane
The reaction of 2,2-dimethyl-1-propanol with HBr is very slow and gives 2-bromo-2-methyl-propane as the major product. Give a mechanistic explanation for these observations
A student attempted to identify an unknown compound by the method used in this experiment. she found that when she heated a sample weighing 0.4826 g, the mass barely changed
Based on your answer to (1), would you be more or less confident about your density measurement if you used the smaller sample volume, rather than the normal 8 mL sample volume? Briefly explain.
You performed A nitration reaction in 15 minutes to completion. Assume it took the entire allotted time. If we used anisole instead of methyl benzoate to run an analogous reaction, how much time would a similar nitration reaction take.
f gas reacts with nh3 gas to produce n2f4 tetrafluorohydrazine or dinitrogen tetrafluoridenbspand hfhydrogen fluoride.
Camphor (C10H16O) melts at 178.4 degrees C and has Kf=37.7 K/m. A sample of unknown substance that weighs .840g lowers the freezing point of 25g of camphor to 170.8 degrees C. What is the molar mass of unknown substance
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