Campden tablets Totally Explained

Everything about Campden Tablets totally explained

Campden tablets (potassium or sodium metabisulfite) are a sulfur based product that's used primarily in wine, cider and beer making to kill certain bacteria and to inhibit the growth of most wild yeast: this product is also used to eliminate both free chlorine, and the more stable form, chloramine, from water solutions (for example, drinking water from municipal sources). Campden tablets allow the amateur brewer to easily measure small quantities of sodium metabisulfite, so it can be used to protect against wild yeast and bacteria without affecting flavour. Typical use is one crushed Campden tablet per gallon of must or wort. This dosage contributes 67 ppm sulfur dioxide to the wort but the level of active sulfur dioxide diminishes rapidly as it reacts with chlorine and chloramine, and with aldehydes (particularly in wine). Therefore, the concentration of free sulfur dioxide is greatly diminished by the time the beer or wine is consumed. However, when used only for the purpose of dechlorinating tap water before brewing, 1 tablet will effectively treat 20 gallons of water.
   Campden tablets are also used towards the end of the fermentation process to halt the ferment before all the available sugars are converted by the yeast, hence controlling the amount of residual sweetness in the final product. This balancing between sweet, dry and tart flavors is part of the artistry of wine and cider making.
   Campden tablets typically weigh 0.44 g each and 10 of these are equivalent to one level teaspoon of sodium metabisulfite.
   See potassium metabisulfite and sodium metabisulfite. Other related substances are, sodium/potassium sulfite/bisulfite. Further complicating the subject, each is also referred to interchangeably as --sulfites, and the 'bi' can be found as 'di'. In terms of usage, sodium thiosulfite is a closely related compound.
   The molar mass (commonly called molecular weight or MW) of potassium metabisulfite is 222 grams per mole, while the molecular weight of sodium metabisulfite is 190 g/mol.

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