Question

picric acid, a weak acid, is dissolved in water to prepare a 0.100 m solution. the ph of the solution was found to be 1.09. calculate ka for picric acid at this temperature.

Answer 1

The Ka value for picric acid at this temperature is 1.02 x 10^(-3).

Step-by-step explanation:

The pH of a solution is a measure of its acidity or alkalinity. It is calculated using the formula pH = -log[H+]. Given that the pH of the 0.100 M solution of picric acid is 1.09, we can rearrange the equation to solve for [H+].

pH = -log[H+]
10^(pH) = [H+]
[H+] = 10^(-1.09) M

Now, we can use the equation for Ka to calculate the Ka value:

Ka = [H+][A-] / [HA]
Ka = (10^(-1.09))^2 / 0.100
Ka = 1.02 x 10^(-3)