4. Compounds might have more than pKa.
5. We usually prefer to prepare buffers from alkaline origin compounds.
6. The pH of a buffer solution containing .1 M acetic acid and 0.1 M sodium acetate? (Ka for acetic acid = 1.75 ×10-5) is 3.9.
7. The pH of a solution containing ephedrine 0.1 M and ephedrine HCI 0.01 M? (Kb for ephedrine = 2.3 x 10-5) is 7.99.
8. The maximum buffer capacity for solutions can be achieved when the required pH double than pKa of the acid..
9. When one of the buffer components is depleted completely the solution lose its buffering capacity and can no longer resist the change in pH.
10. At a hydrogen ion concentration of 1.75 x 10-5, what is the capacity of a buffer containing 0.10 mole each of acetic acid and sodium acetate per liter of solution? (Ka = 1.75 x 10-5 ) is 9.11.
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