1. what is the ph of a 0.085 m solution of nitrous acid (hno2) that has a ka of 4.5 × 10-4? 2.21 5.33 3.35 4.42

The chemical reaction for nitrous acid in a solution with water is
                 HNO2 + H2O(l) ⇄ H3O^+ + NO2^-
Then
                 Ka = [H3O^+][NO2^-] / [HNO2]
If we let x represent the concentrations of [H3O^+] and [NO2^-] then
                 Ka = x^2 / [HNO2]
                    x = √(Ka * [HNO2])
                    x = √(4.5 × 10^-4 * 0.085)
                    x = 6.1846 x 10^-3 = [H3O+]
Therefore
                  pH = -log[H3O+]
                  pH = -log[6.1846 x 10^-3]
                  pH = 2.21
The answer to your question is 2.21.

A1 a 2 a 3 ooh lol i think that's it

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.