Lecture+12 - Acid-base titration properties and...

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Acid-base titration properties and applications The isoionic point is the pH of the pure protein with no ions present except H+ and OH . The isoelectric point is the pH at which the average charge on the protein is 0
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Strong base –strong acid In the titration of any strong base with any strong acid, there are three regions of the titration curve that require different kinds of calculations : 1. Before the equivalence point, the pH is determined by excess OH in the solution. 2. At the equivalence point, H + is just sufficient to react with all OH to make H 2 O. The pH is determined by dissociation of water. 3. After the equivalence point, pH is determined by excess H+ in the solution. log pOH OH =− w OH H K −+ ⎡⎤ == ⎣⎦ log p HH +
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Strong base –strong acid Calculate the pH at each of the following points in the titration of 50.00 mL of 0.010 0 M NaOH with 0.100 M HCl. Volume of acid added: 0.00, 1.00, 2.00, 3.00, 4.00, 4.50, 4.90, 4.99, 5.00 , 5.01 , 5.10, 5.50, 6.00, 8.00, and 10.00 mL. .
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Lecture+12 - Acid-base titration properties and...

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