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+x. This follows from the equilibrium expression. The third row, labelled E for "equilibrium", adds together the first two rows and shows the concentrations at equilibrium.

To find x, use the formula for the equilibrium constant in terms of concentrations:

Substitute the concentrations with the values found in the last row of the ICE table:

Simplify to

With specific values for C₀, K_a and y, this equation can be solved for x. Assuming that pH = -log₁₀[H⁺],

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