Buffers Resist change in pH when H + or OH - added Two most common types: –Weak acid and its conjugate base salt. (ex) HF / NaF –Weak base and its conjugate.

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Presentation transcript:

Buffers Resist change in pH when H + or OH - added Two most common types: –Weak acid and its conjugate base salt. (ex) HF / NaF –Weak base and its conjugate acid salt. (ex) NH 3 / NH 4 Cl

Buffers Given a nitrous acid/sodium nitrite buffer: Add acid: Add base: consumed by base consumed by acid

Buffers Given an ammonia/ammonium chloride buffer: Add acid: Add base: consumed by base consumed by acid

NOT Buffers Pure water Add acid: Add base:

NOT Buffers Given an NaOH solution Add acid: Add base:

Buffers Any solution that contains –something that can consume H + ions (basic properties) AND –something that can consume OH - ions (acidic properties) can act as a buffer.

Buffers In what other ways could a buffer system exist? (besides WA-CB salt or WB-CA salt)