188x Filetype PPTX File size 0.78 MB Source: content.schoolinsites.com
Acid-Base Titration The process of adding a strong acid or a strong base to a titrate of acid or base with the purpose of neutralizing the substance in the beaker + - Looking to reach equivalence point mol H = mol OH Acid-Base Titration Generally done with a pH probe, which is used to create a graph of pH vs. volume added H p Volume added Determination of the Equivalence Point Ways to find the equivalence point 1. Can find it stoichiometrically using stoichiometry for the neutralization reaction + - mol H = mol OH stoichiometrically Determination of the Equivalence Point Ways to find the equivalence point 2. Can find it graphically based on pH vs. volume graph When the titrate is neutralized completely by the titrant, the pH changes dramatically The midpoint of this dramatic change is the equivalence point – the middle of the area where neutralization is happening Use of an Acid-Base Indicator • If the pH at the equivalence point is known, an indicator can be used • Want the pKa of the indicator to match the pH at the equivalence point • Indicator will then change color as pH changes dramatically, giving visual end to the titration
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