Chemguide: Support for CIE A level Chemistry

This statement is about the use of sulphur dioxide as a food preservative.

Before you go on, you should find and read the statements in your copy of the syllabus.

Sulphur dioxide is used as a preservative in, for example, wine and dried fruit and vegetables.

It has two functions. It is a reducing agent and so slows oxidation of the wine or dried fruit by oxygen in the air. And it also kills bacteria.

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