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1.The solubility of benzoic acid in water is 6.80 g per 100 mL at 100 °C and 0.34 g per 100 mL at 25 °C. a) Calculate the minimum volume of water needed to dissolve 1.00 g of benzoic acid at 100 °C. b) Calculate the maximum theoretical percent recovery from the recrystallization of 1.00 g of benzoic acid from 15 mL of water, assuming the solution is filtered at 25 °C. 2. The solubility of acetanilide in your recrystallizing solvent is 5.0 mg per mL at 10 °C.
a)Calculate the maximum percent recovery in this experiment, assuming a 15.0-mL recrystallizing solution is filtered at 10 °C. b) Calculate the percentage recovery of acetanilide produced in your experiment. c)How do your results compare to the maximum percent recovery? Briefly explain. 3. A student rushed through this experiment. Describe the effect that the following procedural changes would have on the percent recovery of acetanilide. Briefly explain the basis of each answer. a) Rather than adding 0.5-mL portions of boiling solvent to the acetanilide, the student added 5-mL portions of boiling solvent. b) The student did not pre-heat the gravity filtration apparatus in Part 3. c) The student forgot to cool 5 mL of solvent in Part 5 and washed the crystals with room temperature solvent.
A solution of .162 M NaOH is used to neutralize 25.0 mL of a H2SO4 solution. if 32.8mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)>Na2SO4(aq)+2H2O(l)
Change in internal energy E, At 25'C, enthalpy change H for the combustion of liquid octane, C8H8(l), to form CO2(g) and H2O(l) is -5471kJmol-1
Write net Bronsted equations that show the acidic or basic nature of the following substances, given the pH. For polyprotic acids, only show one proton transfer. Remember that spectator ions are not included.
CH3COOH (Ka=1.8x10^-5) was titrated with 0.50 M NaOH. Calculate the pH after addition of 30.0mL of NaOH
The density of an unknown metal is 8.94 g/cm^3 and its atomic radius is 0.126 nm. It has a face-centered cubic lattice. Find the atomic weight of this metal.?
What can be said about the stoichiometric coefficients of a balanced chemical reaction AND the powers to which the concentrations are raised in the rate-law expression
Consider the following mechanism for the oxidation of bromide ions by hydrogen peroxide in aqueous acid solution. H+ + H2O2 ? H3O2+ (rapid equilibrium)
They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride solution. The mass of BaSO4 obtained was 0.5032g. What is the average mass percent of saccharin in the tablets
the mineral greenockite is a rare yellow sulfide of cadmium that is 78.0 cadmium and 22.0 sulfur by mass. determine the
what molar ratio of benzoate ion to benzoic acid would be required to prepare a buffer with a ph of 5.20? kac6h5cooh
Draw the carboxylic acid produced from the acid hydrolysis of butyl acetate (butyl ethanoate)
Catalyst works by lowering action barrier of rate limiting step. In a 1st order reaction, concentration of reactant is doubled then rate of reaction is doubled.
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