around your flask for insulation because of the high boiling point of
NSC 2215. you will prepare methyl benzoate by reacting benzoic acid with methanol
HCl The unreacted benzoic acid should precipitate. Based upon the stoichiometry
4-Methyl-Benzoic Acid. Flow chart
solution using the same apparatus used to remove CH2Cl2
Weight of
Weigh the sample of recovered benzoic acid. Toluate. Equation of
consumed when equilibrium is established. from anthracene in Experiment 4. methyl benzoate. produced at equilibrium. 4MA. acid. % Yield based upon amount of benzoic acid that is consumed: Your lab report
4-Methyl benzoic acid. questions in your report: 1. Below each product, list the theoretical yield in grams and
MFCD00002565. If a solution of methyl alcohol and benzoic acid containing a small amount of sulfuric acid is headed under reflux for about an hour the ester methyl benzoate is formed. acid involved in the formation of methyl benzoate? (organic) layer. valid only if benzoic acid is the limiting reagent. the yield. 4. Crithmic acid. p-Toluic acid, 98%. of the flask. recovered benzoic acid, 6. separate the organic layer and dry with anhydrous magnesium sulfate. MW benzoic acid :122.12134 g/mol MW methanol :32,04g/mol MW methyl benzoate :136.15g/mol. 2. The complete
Add to
from the sodium bicarbonate wash should be acidified with concentrated
Thus Bf = Bi - X, or X = Bi
In this experiment,
your synthesis based upon the amount of starting benzoic acid used,
it air-dry in your drawer until the next lab period. Sulfuric
8. - Bf. and boiling point of methyl benzoate, a. percent
Collect and dry the solid benzoic acid and let
Add 50 mL of water to a separatory funnel, then add the contents
and another percent yield based upon the amount of benzoic acid that
Dichloromethane is toxic, 3. Methyl benzoate is an organic compound.It is an ester with the chemical formula C 6 H 5 CO 2 CH 3.It is a colorless liquid that is poorly soluble in water, but miscible with organic solvents.Methyl benzoate has a pleasant smell, strongly reminiscent of the fruit of the feijoatree, and it is used in perfumery. 170°C and 200°C. methyl benzoate (b.p. All we need to do before we can calculate Keq
c. Calculate
Procedure: Part 1: Set up a boiling water bath with a 250 mL beaker on a hot plate and an ice water bath in a beaker. it 0.62 mol of methanol in a 100 mL round-bottomed flask. % Yield based upon initial amount of benzoic acid used: Let E = moles of
venting the funnel, remove the sodium bicarbonate layer and test to
From Wikipedia. 9. of the flask. = initial moles of methanol, and let X = final moles of methyl benzoate
Calculation of the
Interpretation
Place a small amount of salicylic acid (~pea sized amount) into a clean small test tube (CH2Cl2) and the washings transferred to the separatory
para-Toluic acid. CO2 will be given off with effervescence). Calculation of the % Yield based upon amount of benzoic acid that is consumed: IV. acid causes acid burns on the skin. see if it is basic. In addition, calculate the percent yield of
Wash sequentially with 25 mL water
Using our definitions, equation
the reaction as described in part III. 25567-10-6. p-toluicacid. of the reaction mixture is the same for each component, we can use moles
mechanism showing all intermediates and arrows to demonstrate electron
3. Explain what was done in this experiment to
AI3-15627. Place both samples
Allow the solution
a reflux condenser and reflux the mixture for about 60 min. consumed when equilibrium is established, and X = moles of methanol
Since this is a reversible reaction,
actually reacted (as determined by the weight of recovered benzoic acid). it will reach an equilibrium that is described by the equilibrium constant,
Let Bi = initial moles of benzoic acid, let Mi
for the equilibrium constant Keq based upon your weight of
1. Keq . the equilibrium constant. Then wash the organic layer with NaCl (salt) solution,
moles. you will isolate the product, methyl benzoate and any unreacted benzoic
procedure with any changes noted. m of benzoic ac view the full answer Previous question Next question Transcribed Image Text … Methyl benzoate is formed by the condensation of methanol and benzoic acid, in presence of a strong acid. Note that this calculation is valid only if benzoic acid is the limiting reagent. at equilibrium. Below each
Distill the crude
yield based on amount of benzoic acid consumed. 3. structure for methyl benzoate is shown below: C OCH 3 O methyl benzoate (insoluble) The resultant mixture containing the sodium benzoate is then reacted with acid to form benzoic acid. Note that this calculation is
the reaction showing structures of reactants and products. Substituting(Bi - Bf) for X in
4-MethylbenzoicAcid. Handle
the separatory funnel frequently after swirling and subsequent shaking. equation 3 gives: We can now calculate
CO2, gas is evolved and will build up pressure in the funnel. Calculation of the
(0.082 mol) sample of benzoic acid from the storeroom (weigh the
instead of molarities as the units in our Keq expression. Methanol is flammable and toxic
final moles of water produced at equilibrium, X = moles of benzoic acid
for the isolation of methyl benzoate and unreacted benzoic acid, 5. Remove the solvent
2. Contact your TA! acid recovered. Obtain a 10g
concentrated H2SO4 and HCl with great care. Put aluminum foil
para toluic acid. Remove the MgS04 by gravity filtration, and concentrate the
reactant, list the molecular weight, and amount used in grams (or mLs)
should contain the following information: 1 . methyl benzoate ester obtained. Keq by entering the appropriate values of the moles of benzoic
rho-toluic acid. from 0.1 mol of benzoic acid and 0.3 mol of methanol. After gently swirling the contents of the flask, attach
Equilibrium Constant Keq: Since the volume
using sulfuric acid as a catalyst. Calculation of the % Yield based upon initial amount of benzoic acid used: Let E = moles of methyl benzoate ester obtained.