Here, the ability to donate protons as hydrogen ions is the definition of an acid, whereas the ability to accept protons is the definition of a base.
Because these substances can give or release a hydrogen ion, acids are regarded as proton donors in accordance with the Bronsted-Lowry Theory. Continue reading for the complete response. Because hydrogen only has one proton, it donates that proton to the other substance if the bond holding the hydrogen to the acid is broken but the electron is left behind. A molecule in addition to water is required for an aqueous solution to be acidic or basic. Acidic molecules are those that increase the concentration of free protons in a solution; bases are those that bind to free protons and pull them out of solution to change a solution's pH.
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