# Problem: A solution of formic acid (HCOOH, Ka = 1.8 X 10 -4) has a pH of 2.70. Calculate the initial concentration of formic acid in this solution.

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###### FREE Expert Solution

We’re being asked to calculate the initial concentration of formic acid, HCOOH solution with a pH = 2.70.

For this, we need to do the following steps:

Step 1: Write the dissociation reaction of HCOOH solution in water

Step 2: Construct an ICE chart to determine the initial concentration of HCOOH

Step 3: Solve for H3O+ concentration at equilibrium from the given pH

Step 4: Calculate the initial concentration of HCOOH based on the given Ka

Step 1: Remember that weak acids partially dissociate in water and that acids donate H+ to the base (water in this case).

The dissociation of HCOOH is as follows:

HCOOH(aq) + H2O(l)  H3O+(aq) + COOH(aq) ###### Problem Details

A solution of formic acid (HCOOH, Ka = 1.8 X 10 -4) has a pH of 2.70. Calculate the initial concentration of formic acid in this solution.