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pK of the weakest acid or base that can be titrated in aqueous solution

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What is the appropriate PK of the weakest acid or base that can be titrated in aqueous solution?

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Solution Summary

It shows the appropriate PK of the weakest acid or base that can be titrated in aqueous solution.

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See Also This Related BrainMass Solution

Plotting a titration curve for Ala and His

Here is the problem:

1. Assume you have a solution containing 0.1 mol of Ala adjusted to pH = 0.5 with HCl. You begin adding 1.0 M NaOH. Plot (do not sketch) the resulting titration curve (pH vs. moles NaOH added) showing all inflection points. Show your calculations and be sure to state your assumptions.

2. Plot a similar titration curve for a solution containing 0.1 mol of His at pH = 0.5. (pKa values: Ala: alpha-COOH = 2.3, alpha-NH2 = 9.7; His: alpha-COOH = 1.8, alpha-NH2 = 9.2, Imidazole = 6.0).

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