alkali

Basic explanation and detailed explanation

1. A substance contained in soil, whose chemical composition is sodium carbonate, is used as a detergent and also to neutralize the sour taste in hair: ~ soil. ~ change. ~ shortage.

2. Chemically speaking, compounds that can ionize in aqueous solution to generate hydroxyl ions (OH-), such as sodium hydroxide. The solution has astringent taste, which can turn litmus paper blue and neutralize with acid to form salt: ~ metal. ~ type salt. ~ sexy rock.