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I am doing my investigation on wine analysis and was unsure of how to calculate the content of sulphur dioxide in each of the wines after I have performed the titrations. I would be very grateful for some help.
Igloo replies ...
You do not say what type of titration you carried out. Was it with iodine, for example?
Assuming that the titrations were carried out with a standard solution of iodine, and that this solution was in the burette with the sample of wine was in the flask, the steps are as follows:
1 Using your ‘average’ titration reading, calculate the number of moles of iodine used.
2 Using the equation for the reaction between sulphur dioxide and iodine, deduce the number of moles of sulphur dioxide with which the iodine reacted.
3 Given that this sulphur dioxide was in your pipetted volume of wine, calculate the number of moles of sulphur dioxide in 1 dm3.
4 This is the concentration (mol dm-3) of sulphur dioxide in wine.
5 You may wish to convert this value to ppm (parts per million) if you wish to compare your results with official values.
Risk assessment
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For further guidance see our tutorial on Risk Assessment.
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updated: 17 December 2006
