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buffering agent
A buffering agent is a weak acid or base used to maintain the acidity (pH) of a solution near a chosen value after the addition of another acid or base. That is, the function of a buffering agent is to prevent a rapid change in pH when acids or bases are added to the solution. Buffering agents have variable properties—some are more soluble than others; some are acidic while others are basic. As pH managers, they are important in many chemical applications, including agriculture, food processing, biochemistry, medicine and photography.
==Overview==
A buffering agent can be either a weak acid or weak base. Buffering agents are usually added to water to form a buffer solution, which only slightly changes its pH in response to other acids and bases being combined with it, particularly a strong acid or a strong base. Another example is buffered aspirin which has a buffering agent, such as MgO or CaCO3, that will help maintain the balance between the acid H-A (protonated) and the salt A− (deprotonated) forms of aspirin as it passes through the acidic stomach of the patient. The H-A form of aspirin is a covalent molecule and is more absorbed by the stomach lining, leading to irritation. The antacid properties of these buffering agents help to maintain the balance toward the salt form by reducing the amount of stomach acid (HCl) which protonates the salt form, A−.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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