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The Molecular Formula of Succinic Acid.

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Introduction

The Molecular Formula of Succinic Acid Introduction: I have been provided with a sample of anhydrous succinic acid and my task is to determine via titration its true molecular formula where 'n' is a whole number between 1 and 4 to be found. HOOC(CH2)NCOOH The acid is a white crystalline solid and is very soluble in water. Succinic acid is also diprotic (dibasic) and in the same way as sulphuric acid a solution of succinic acid may be completely neutralised by sodium hydroxide solution. If succinic acid is represented as 'H2A' then the equation for full neutralisation is: H2A + 2NaOH Na2A + 2H2O (Phenolphthalein will be a suitable indicator) Appreciation of scale: Having been given a 0.1M solution of sodium hydroxide and told that succinic acid is dibasic, it then follows that a 0.05M solution of succinic would be most suitable due to the two to one ratio. As I don't know the value of 'n' yet, only that its between 1 and 4, if I'm to work out the amount of acid required to make a 0.05M solution then I am going to have to use a hypothetical value for 'n'. ...read more.

Middle

Insert the stopper and shake to mix the contents. 7. Then using a dropping pipette, add enough water to bring the bottom of the meniscus to the mark. Insert the stopper again but this time shake thoroughly ten times to ensure complete mixing. 8. Clearly label the flask with contents, your name and the date. The Titration Method Used: Now a standard solution of succinic acid is available the titration can be carried out as follows: 1. Using the funnel, rinse the burette with the succinic acid solution and fill it accurately with the same solution until the 50cm3 mark. Do not forget to rinse and fill the tip first though. 2. Using the pipette filler, rinse the pipette with some of the sodium hydroxide solution and carefully transfer 25.0cm3 of the solution to a clean 250cm3 conical flask (Remembering to touch the bottom of the flask with the tip of the pipette for ten seconds to fully empty the pipette). 3. Add 2-3 drops of the phenolphthalein indicator solution. ...read more.

Conclusion

of moles Molecular mass = 1.65 ? 0.0125 132g Therefore if the molecular mass of succinic acid is 132g then 'n' can be found by simply subtracting all but the (CH2)N from HOOC(CH2)NCOOH leaving: (CH2)N = 42g (14)N =42g N = 3 Safety Precautions: As with all work carried out in a laboratory certain safety precautions must be upheld. The first of these is safety glasses, which must be worn at all times during the experiment to protect the eyes from the toxic and corrosive chemicals involved. The second is when filling the burette and the pipette to do it properly with the right equipment (a filter funnel and a pipette filler respectively) to ensure there are no spillage's and hence no skin contact with the corrosive chemicals being used. The last thing is a bit of common sense, making sure the burette is at a suitable height when filling it so that you aren't stretching and therefore increasing the risk of spillage. Accuracy of Equipment: 250cm3 flask: ?0.5cm3 (0.5?250?100) = 0.2? 25cm3 pipette: ?0.05cm3 (0.05?25?100) = 0.2? 50cm3 burette: ?0.15cm3 (0.15?50?100) = 0.3? Hence the total maximum percentage error for the experiment is 0.7?. Gabe Mc Comish 13e ...read more.

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