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- The dissociation constant, ka, of a weak acid is 5.9 x 10-6. What is the pKa of the acid?What is the pKa value of Tris-HCl?Salts containing the phosphate ion are added to municipal water supplies to prevent the corrosion of lead pipes. Based on the pKa values for phosphoric acid (pKa1 = 7.5 * 10-3, pKa2 = 6.2 * 10-8, pKa3 = 4.2 * 10-13) what is the Kbvalue for the PO43- ion?
- The Ka for an acid is 7.91 x 10-29. Calculate the pKa for this acid.pKa values are different in different solvents. For example, the pKa of hydrofluoric acid (HF) in water is 3.45, but the pKa of hydrofluoric acid in DMSO (dimethyl sulfoxide) is 15.0. Choose the best explanation for the differenceWhat is the pKa of an acid? As the pKa value increases, does the acid strength increase or decrease? Explain.
- Use a calculator when necessary to answer the following questions. a. What is the pKa for each Ka: 10−10, 10−21, and 5.2 × 10−5? b. What is the Ka for each pKa: 7, 11, and 3.2?What is the pH of a 0.10 M solution of an acid with a pKA of 8.4?Define pKa and provide at least one method for determining its value.
