NH3 weak base
HCOOH weak acid
H3PO4 weak acid
NaOH strong base
A strong base is a chemical substance that is sufficiently basic to deprotonate—remove a proton (H+) from—a molecule of even a very weak acid, like water. Alkali metal and alkaline earth metal hydroxides, such as NaOH and Ca(OH) 2, are frequent examples of strong bases.
A base is a substance that can receive hydrogen cations (H+), often known as protons, according to the more comprehensive Brnsted-Lowry acid-base theory (1923). Since OH does react with H+ to generate water, this does contain aqueous hydroxides, making Arrhenius bases a subset of Brnsted bases. Aqueous solutions of ammonia (NH3) or its chemical compounds are examples of other Brnsted bases that receive protons (amines).
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