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Hydrolysis of an Ester

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Introduction

Hydrolysis of an Ester Aim: To hydrolyse the ester methyl benzoate to produce benzoic acid and to calculate the yield of the procedure and its melting point. Equation: C6H5COOCH3 + OH- C6H5COO- + CH3OH C6H5COO- + H+ C6H5COOH Apparatus: * 50cm3 round bottomed flask * Three 10cm3 measuring cylinders * Anti-bumping granules * Water filled condenser and rubber tubing * Bunsen burner * Stand and Clamp * Gauze and Tripod * 250cm3 and 100cm3 beakers * Spatula * Stirrer Procedure: 1. I measured 2.0cm3 of methyl benzoate, then 10cm3 of ethanol and 10cm3 of 2.0 moldm-3 sodium hydroxide into a 50cm3 round bottomed flask containing anti-bumping granules using three 10cm3 measuring cylinders. ...read more.

Middle

I heated the tube until the crystals disappeared and then placed the boiling tube in a beaker of cold water to cool. I filtered the product again under reduced pressure. 5. I placed the crystals on a piece of filter paper and left them to dry in the oven over night. 6. I weighed a small pot, then added the crystals to the pot and weighed it again. The pot had a mass of 15.92g and with the crystals had a mass of 16.92g, meaning the crystals had amass of 1.00g. 7. I sealed one end of a melting point tube using a Bunsen burner. I put a few crystals into the tiny tube and forced them to the bottom. ...read more.

Conclusion

Ethanol: This is highly flammable so I did not have a Bunsen burner alight while I was measuring it out. Hydrochloric acid (2.0 moldm-3): This concentration is irritant, so I wore eye protection and a lab coat at all times and handled the solution with extreme care. Sodium hydroxide (2.0 moldm-3): This concentration is corrosive and reacts violently with water. I, therefore, wore eye protection and a lab coat and did not mix it with water. Methyl orange: To avoid contact with skin I used a pipette to measure out the methyl orange indicator. General precautions: I wore a lab coat and goggles at all times. ?? ?? ?? ?? Oliver Fricker (CC) Chemistry Coursework Implementation Page1 ...read more.

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