buffers - The acid/base conjugates should have similar...

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Feedback: A good buffer consists of a weak acid + its conjugate base, or, a weak base + its conjugate acid. The acid/base conjugates should have similar concentrations (within a factor of 10), so that the buffering capacity is about the same for neutralizing any strong acid or strong base added to the system. All of the concentrations are within a factor of 10 for the systems above, so consider just the compounds: System ... Buffer ? hypochlorous acid ... + ... sodium hypochlorite HClO = weak acid ClO - = conjugate base YES perchloric acid + potassium perchlorate HClO 4 = strong acid ClO 4 - = conjugate base ammonium nitrate + ammonia NH 4 + = conjugate acid NH 3 = weak base YES potassium nitrite + nitrous acid NO 2 - = conjugate base HNO 2 = weak acid YES hydrocyanic acid + sodium cyanide HCN = weak acid CN - = conjugate base YES Feedback: A good buffer consists of a weak acid + its conjugate base, or, a weak base + its conjugate acid.
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Unformatted text preview: The acid/base conjugates should have similar concentrations (within a factor of 10), so that the buffering capacity is about the same for neutralizing any strong acid or strong base added to the system. All of the concentrations are within a factor of 10 for the systems above, so consider just the compounds: System ... Buffer ? hydrocyanic acid ... + ... potassium cyanide HCN = weak acid CN-= conjugate base YES perchloric acid + potassium perchlorate HClO 4 = strong acid ClO 4-= conjugate base ammonium bromide + ammonia NH 4 + = conjugate acid NH 3 = weak base YES sodium hydroxide + sodium bromide NaOH = strong base NaBr = neutral salt hypochlorous acid + potassium hypochlorite HClO = weak acid ClO-= conjugate base YES...
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This note was uploaded on 05/07/2010 for the course CHEM 116 taught by Professor Stevenson during the Spring '08 term at Purdue.

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buffers - The acid/base conjugates should have similar...

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