What is a substance that causes the releases of OH- ions into a solution

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A substance that causes the release of OH- ions into a solution is called a base. Bases are characterized by their ability to accept protons (H+) from an acidic solution, thereby increasing the concentration of OH- ions in the solution. Examples of bases include hydroxides (e.g. sodium hydroxide - NaOH) and carbonates (e.g. sodium carbonate - Na2CO3).