Farmers who raise cotton once used arsenic acid, h₃aso₄, as a defoliant at harvest time. arsenic acid is a polyprotic acid with ka₁ = 2.5 × 10⁻⁴, ka₂ = 5.6 × 10⁻⁸, and ka₃ = 3 × 10⁻¹³. what is the ph of a 0.500 m solution of arsenic acid?

Explanation:

The reaction equation will be as follows.

Hence, the expression for is as follows.

Let us assume that the concentration of both and is x.

                          x = 0.01118034

This means that the concentration of is 0.01118034.

Since, we know that the relation between pH and concentration of hydrogen ions is as follows.

              pH =

                    =

                    = 1.958

Thus, we can conclude that the pH of a 0.500 M solution of arsenic acid is 1.958.

3

explanation:

0.88m hope i am correct : )