Question

A solution of 8.00 M formic acid (HCHO2) is 0.47% ionized in water.

Calculate the Ka value for formic acid.

Answer 1

The Ka value for formic acid can be calculated using the percent ionization.

Step-by-step explanation:

The Ka value for formic acid can be calculated using the percent ionization. In this case, the solution of 8.00 M formic acid is 0.47% ionized in water. To calculate the Ka value, we can use the formula:

Ka = [H+][A-]/[HA]

Where [H+] is the concentration of the hydronium ion, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid. Since the percent ionization is given, we can assume that [H+] = [A-], and [HA] = 8.00 M. Therefore, substituting the values into the formula, we get:

Ka = (0.47/100)(8.00)/((1 - 0.47/100) * 8.00)

Simplifying this equation gives us Ka = 1.35 x 10^-3.