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Using Equilibrium Tables to Solve Problems

Many equilibrium problems can be solved using an equilibrium table. The table is constructed with a column under each species in the equilibrium equation, and three rows labeled i (initial), c (change), and e (equilibrium). (This is why such a table is sometimes referred to as an ice table.) [Pg.688]

We use pH to determine the equihbrium concentration of H p+] = lo-pH = 10-3 82 = 15 X IQ- M Because the ionization of HA produces equal amounts of H the equilibrium concentration of A- is also 1.5 X 10 these concentrations in the bottom row of the table. [Pg.688]

To complete the last row of the table, we also need the equilibrium value of [HA]. The amount of weak acid that ionized is equal to the amount of H+ jjroduced by the ionization. Therefore, at equilibrium, [Pg.689]

Because the magnitude of is small, we expect the amount of HA ionized (x) to be small compared to 0.10. Therefore, we can assume that 0.10 - x == 0.10. This simplifies the solution to [Pg.689]

With the bottom row of the table complete, we can use these equilibrium concentrations to calculate the value of [Pg.689]




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