GOALS 44 and 45 Overheads

GOALS 44 and 45 Overheads - GOAL 44: Buffers A buffer is a...

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GOAL 44: Buffers A buffer is a solution containing a weak acid and its conjugate base OR a weak base and its conjugate acid in sufficient amounts to resist a change in pH when an acid or base is added to the buffer solution. Some examples: H 2 CO 3 and HCO 3 - H 2 PO 4 - and HPO 4 2 - NH 4 + and NH 3 How prepare? Choose acid with pK a near the pH desired for your buffer. You also want as close to a 1:1 ratio of acid/conjugate base as possible for best buffering. Then when OH - are added they react with the conjugate acid in a neutralization reaction. If H + are added, they react with the conjugate base in a neutralization reaction.
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GOAL 45: Titrations: Now it’s time to pull it all together in titration situations. A titration is a chemical analysis in which two reactants are combined in exact stoichiometric amounts. The volume of a solution of known concentration (the titrant) is added to a solution containing the unknown (analyte). The equivalence point occurs when the
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GOALS 44 and 45 Overheads - GOAL 44: Buffers A buffer is a...

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