A typical equilibrium problem:
2 H2O(l) → ← H3O+(aq) + OH– (aq)
Kw = [H3O+]e[OH–]e = 1.0×10–14
Initial0 0
Change+x +x
Equilibriumx x
1.0×10–14 = x2
x = [H3O+]e = [OH–]e = 1.0×10–7 M
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