What is another word for alkaline?

There are many words that can be used to describe something as alkaline, depending on the context and the level of formality:

Formal:

* Basic

* Alkaline (this is the most formal and precise term)

* Alkali (can be used as an adjective, but it's more commonly a noun)

Informal:

* Base

* Caustic (for strong alkalis)

* pH-balanced (indicates neutrality)

* High pH (specifically refers to the numerical measurement)

Synonyms for "alkaline solution":

* Base solution

* Alkaline solution

* Basic solution

The best word to use depends on the context and the intended audience.