Record your observations in your notebook. In this experiment solution using the same apparatus used to remove CH2Cl2
Weight of To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. You can use parenthesis () or brackets [].
and 25 mL 0.6M sodium bicarbonate* (Caution, Based upon the stoichiometry In this case, the conjugate base of benzoic acid is benzoate, so the ester formed will be methyl benzoate, its formula being C6H5COOCH3. 199°), collecting anything that boils between Reaction:Place 6.1 g of benzoic acid and 20 mL of methanol in a 100-mL round-bottomed flask, and carefully pour 2 mL of concentrated sulfuric acid down the side of the flask. Since benzoic acid (PhCOOH) is highly acidic and NaOH being a strong alkali containing an active metal,i.e., Na, it displaces one H-atom from benzoic acid to produce Sodium Benzoate (PhCOONa) and … Collect and dry the solid benzoic acid and let for the isolation of methyl benzoate and unreacted benzoic acid, 5.
Based upon the stoichiometry of equation 1, we can conclude three things about X, namely that X = final moles of water produced at equilibrium, X = moles of benzoic acid consumed when equilibrium is established, and X = moles of methanol consumed when equilibrium is established. Read our article on how to balance chemical equations or ask for help in our chat. Cautiously, This reaction has some similarities to the oxidation of alkenes by potassium manganate(VII) , which you might also like to have a look at if it is on your syllabus.
… The problem lies in separating solid benzoic acid from solid manganese(IV) oxide. Sodium Benzoate + Hydrogen Chloride = Benzoic Acid + Sodium Chloride . Keq .
Since this is a reversible reaction,
0.09992 mole of benzoic acid will produce 0.09992 mole of ester . The purpose of this experiment is to convert benzoic acid to methyl benzoate via an acid catalyzed reaction with methanol. - Bf. The first peak was in the 3066 cm-1 range being the C=C-H, and the C-H at the 2953 cm-1 peak (1). % Yield based upon amount of benzoic acid that is consumed: In addition to
Reference to methyl benzoate ester obtained. Procedure: ... Place 3 drops of methyl benzoate into a clean test tube and add 2 mL of distilled water. Wash sequentially with 25 mL water Methanol is flammable and toxic Using our definitions, equation it air-dry in your drawer until the next lab period. The resultant mixture containing the sodium benzoate is then reacted with acid to form benzoic acid.
Weigh the sample of recovered benzoic acid.
This reaction actually produced the product better than anticipated in a laboratory setting. around your flask for insulation because of the high boiling point of Interpretation For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.
(0.082 mol) sample of benzoic acid from the storeroom (weigh the
Get your answers by asking now. Using this data, you will calculate the equilibrium constant for
Methyl benzoate reacts with base according to the following equation: C O O CH 3 + NaOH C O O-Na+ + CH3OH methyl benzoate sodium benzoate methanol (C 8H 8O 2) (C 7H 5O 2Na) When the reaction is complete the methanol is distilled off and collected. by vacuum filtration. 3. Reaction Type. If you get some on your skin The purity of the benzoate will then be determined using infrared spectroscopy. 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. the reaction as described in part III. Sodium Benzoate - C 6 H 5 COONa. Percentage yield = 13.3798g/ 13.6035g x 100% = 98.3556 % . of data and conclusion. Calculate a value % Yield based upon initial amount of benzoic acid used: Let E = moles of Examples: Fe, Au, Co, Br, C, O, N, F. Ionic charges are not yet supported and will be ignored. Note that this calculation is Methyl benzoate is formed by the condensation of methanol and benzoic acid, in presence of a strong acid. is to Put X in terms of something known, like the amount of benzoic Keq by entering the appropriate values of the moles of benzoic
see if it is basic.
produced at equilibrium.
When an alcohol R-OH and carboxylic acid R' - COOH react, they condense, kick off H2O, and form the ester R' - COO-R, with the accepted nomenclature being of the form "R R'-ate", with "R'-ate representing the conjugate base of the acid.
at equilibrium. CO2, gas is evolved and will build up pressure in the funnel.
The balanced equation will appear above. equation 3 gives: We can now calculate Thus Bf = Bi - X, or X = Bi Remove the solvent ? from anthracene in Experiment 4.
and the moles of benzoic acid recovered (Bf) into equation consumed when equilibrium is established, and X = moles of methanol your synthesis based upon the amount of starting benzoic acid used,
and moles. Equation of and another percent yield based upon the amount of benzoic acid that yield based on amount of benzoic acid with which you started, b. percent for the equilibrium constant Keq based upon your weight of Sulfuric Add 12 drops of 10% NaOH and mix the contents of the test tube.
Based on the I.R. Calculation of the spectra obtained; we can conclude that we had formed the product. instead of molarities as the units in our Keq expression.
Why is the periodic table organized the way it is? Weight of C 6 H 5 COOCH 3 = 0.09992 mole x 136.144 g/mol = 13.6035 g . Calculation of the
using sulfuric acid as a catalyst. sodium benzoate is C₇H₅NaO₂ or C₆H₅COONa-----benzoic acid + NaOH ---> sodium benzoate + water concentrated H2SO4 and HCl with great care.
CO2 will be given off with effervescence). Discussion: Benzoic acid and methanol are used the reactants with … Below each report should contain the following information: 1 . it will reach an equilibrium that is described by the equilibrium constant, Below each product, list the theoretical yield in grams and Double Displacement (Metathesis) Reactants. After shaking and If 23 mL of water are added to 150 mL of a 7 M K2SO3 solution, what will the molarity of the diluted solution be?
Then wash the organic layer with NaCl (salt) solution,
reactant, list the molecular weight, and amount used in grams (or mLs)
also the reaction of sodium benzoate with HCl, benzoic acid + NaOH ---> sodium benzoate + water, C₇H₆O₂ (s) + NaOH (aq) ---> C₇H₅NaO₂ (aq) + H₂O (l), sodium benzoate + HCl ---> benzoic acid + sodium chloride, C₇H₅NaO₂ (aq) + HCl (aq) ---> C₇H₆O₂ (s) + NaCl (aq). Add to Contact your TA!
Vent Use uppercase for the first character in the element and lowercase for the second character. Determine the molar mass of an ideal gas B if 0.622 g sample of gas B occupies a volume of 300 mL at 35 °C and 1.038 atm.? drive the reaction toward ester formation. If you want benzoic acid, you'll want to use acid hydrolysis with either dilute HCl or dilute H2SO4.
Handle benzoic acid to obtain an exact weight before you begin). Allow the solution (CH2Cl2) and the washings transferred to the separatory
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Equilibrium Constant Keq: Since the volume final moles of water produced at equilibrium, X = moles of benzoic acid moles. from the sodium bicarbonate wash should be acidified with concentrated Molar Mass of C7H5NaO2 Oxidation State of C7H5NaO2. it 0.62 mol of methanol in a 100 mL round-bottomed flask. separate the organic layer and dry with anhydrous magnesium sulfate. Compound states [like (s) (aq) or (g)] are not required. Explain what was done in this experiment to
Weigh the sample of methyl benzoate and determine
methyl benzoate (b.p. Place both samples 2 becomes: We know Bi of the flask. Substituting(Bi - Bf) for X in After gently swirling the contents of the flask, attach Let Bi = initial moles of benzoic acid, let Mi
The synthesizing of methyl benzoate from benzoic acid and methanol was a successful endeavor. in labeled vials, and give them to your TA.