Chemical Systems and Equilibrium Question? (Calculating ionization constant)?

Methanoic acid is also called formic acid. It has the chemical formula HCOOH(l). It is a colourless fuming liquid that is mainly used as a preservative. It exhibits the following equilibrium in water: HCOOH(aq) + H2O(l) → HCOO–(aq) + H3O+(aq) If the ionization constant for the above acid is 1.8 x 10–4, the pH of... show more Methanoic acid is also called formic acid. It has the chemical formula HCOOH(l). It is a colourless fuming liquid that is mainly used as a preservative. It exhibits the following equilibrium in water:
HCOOH(aq) + H2O(l) → HCOO–(aq) + H3O+(aq)

If the ionization constant for the above acid is 1.8 x 10–4, the pH of methanoic acid in a 0.35 mol/L solution will be ________.
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