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What is the original molarity of a solution of formic acid (HCOOH) whose pH is 3.26 at equilibrium?
The weak acid constant = 1.7*10^ -4
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- DavidBLv 77 years ago
HA <---> H+ + A-
where HA is the formic acid and A- its conjugate base
using an I.C.E table
Ka = x^2/([HA] - x)
where x is [H+]
so from the pH calculate x, you know Ka substitute these numbers in to the equation and calculate [HA]
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