<P> The terms "base" and "alkali" are often used interchangeably, particularly outside the context of chemistry and chemical engineering . </P> <P> There are various more specific definitions for the concept of an alkali . Alkalis are usually defined as a subset of the bases . One of two subsets is commonly chosen . </P> <Ul> <Li> A basic salt of an alkali metal or alkaline earth metal (This includes Mg (OH) but excludes NH .) </Li> <Li> Any base that is soluble in water and forms hydroxide ions or the solution of a base in water . (This includes Mg (OH) and NH .) </Li> </Ul> <Li> A basic salt of an alkali metal or alkaline earth metal (This includes Mg (OH) but excludes NH .) </Li>

What's the difference between base and alkali
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