Can I simply double the recipe ingredients for a five gallon batch?

Quick answer, Yes. Long answer, No. When designing a recipe that is generic for 5 gallon batches, you have to take some liberties at guessing what style of boil the brewer practices. Based off of that, sometimes there is a fair amount of bittering hops used as partial boils (5 gallon kettle or smaller) don't absorb iso-acids that well as the density of the liquid is higher (more sugar per liquid volume when boiling). The same batch boiled with a full volume boil (8 gallon kettle or larger) will taste slightly different, usually a little more bitter, but not too much. However, if you double your recipe ingredients to make 10 gallons you will tend to have a little too much bittering for the style you are brewing. Many batches you won't taste the difference. A recipe like an IPA, start to get a little to bitter as they use a bunch of hops in the bittering addition. We suggest cutting the bittering hops by 10-15% based on your taste if you plan on doubling your boil volume for brew day. Keep the flavor and aroma additions the same per the recipe.

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